diff --git a/noir-projects/noir-contracts/bootstrap.sh b/noir-projects/noir-contracts/bootstrap.sh
index aa43652e2d77..a441ec1c9789 100755
--- a/noir-projects/noir-contracts/bootstrap.sh
+++ b/noir-projects/noir-contracts/bootstrap.sh
@@ -3,7 +3,7 @@
 # - First of all, I'm sorry. It's a beautiful script but it's no fun to debug. I got carried away.
 # - You can enable BUILD_SYSTEM_DEBUG=1 but the output is quite verbose that it's not much use by default.
 # - You can call ./bootstrap.sh build <package name> to compile and process a single contract.
-# - You can disable further parallelism by putting -j1 on the parallel calls.
+# - You can disable further parallelism by setting PARALLELISM=1.
 # - The exported functions called by parallel must enable their own flags at the start e.g. set -euo pipefail
 # - The exported functions are using stdin/stdout, so be very careful about what's printed where.
 # - The exported functions need to have external variables they require, to have been exported first.
@@ -18,8 +18,9 @@ source $(git rev-parse --show-toplevel)/ci3/source_bootstrap
 
 cmd=${1:-}
 
-export RAYON_NUM_THREADS=16
-export HARDWARE_CONCURRENCY=16
+export RAYON_NUM_THREADS=${RAYON_NUM_THREADS:-16}
+export HARDWARE_CONCURRENCY=${HARDWARE_CONCURRENCY:-16}
+export PARALLELISM=${PARALLELISM:-16}
 export PLATFORM_TAG=any
 
 export BB=${BB:-../../barretenberg/cpp/build/bin/bb}
@@ -116,7 +117,7 @@ function compile {
   # .[1] is the updated functions on stdin (-)
   # * merges their fields.
   jq -c '.functions[]' $json_path | \
-    parallel -j16 --keep-order -N1 --block 8M --pipe --halt now,fail=1 process_function | \
+    parallel -j$PARALLELISM --keep-order -N1 --block 8M --pipe --halt now,fail=1 process_function | \
     jq -s '{functions: .}' | jq -s '.[0] * {functions: .[1].functions}' $json_path - > $tmp_dir/$filename
   mv $tmp_dir/$filename $json_path
 }
@@ -131,7 +132,7 @@ function build {
     set +e
     echo_stderr "Compiling contracts (bb-hash: $BB_HASH)..."
     grep -oP '(?<=contracts/)[^"]+' Nargo.toml | \
-      parallel -j16 --joblog joblog.txt -v --line-buffer --tag --halt now,fail=1 compile {}
+      parallel -j$PARALLELISM --joblog joblog.txt -v --line-buffer --tag --halt now,fail=1 compile {}
     code=$?
     cat joblog.txt
     return $code
diff --git a/noir-projects/noir-protocol-circuits/bootstrap.sh b/noir-projects/noir-protocol-circuits/bootstrap.sh
index 1abd3b832550..bbdba711507d 100755
--- a/noir-projects/noir-protocol-circuits/bootstrap.sh
+++ b/noir-projects/noir-protocol-circuits/bootstrap.sh
@@ -4,8 +4,9 @@ source $(git rev-parse --show-toplevel)/ci3/source_bootstrap
 
 CMD=${1:-}
 
-export RAYON_NUM_THREADS=16
-export HARDWARE_CONCURRENCY=16
+export RAYON_NUM_THREADS=${RAYON_NUM_THREADS:-16}
+export HARDWARE_CONCURRENCY=${HARDWARE_CONCURRENCY:-16}
+export PARALLELISM=${PARALLELISM:-16}
 
 export PLATFORM_TAG=any
 export BB=${BB:-../../barretenberg/cpp/build/bin/bb}
@@ -107,7 +108,7 @@ function build {
           echo "$(basename $dir)"
       fi
     done | \
-    parallel -j16 --joblog joblog.txt -v --line-buffer --tag --halt now,fail=1 compile {}
+    parallel -j$PARALLELISM --joblog joblog.txt -v --line-buffer --tag --halt now,fail=1 compile {}
   code=$?
   cat joblog.txt
   return $code
diff --git a/yarn-project/accounts/package.json b/yarn-project/accounts/package.json
index 2ee45c5862fd..83ff41b53093 100644
--- a/yarn-project/accounts/package.json
+++ b/yarn-project/accounts/package.json
@@ -33,7 +33,7 @@
     "clean": "rm -rf ./dest .tsbuildinfo ./artifacts",
     "formatting": "run -T prettier --check ./src && run -T eslint ./src",
     "formatting:fix": "run -T eslint --fix ./src && run -T prettier -w ./src",
-    "test": "HARDWARE_CONCURRENCY=16 RAYON_NUM_THREADS=4 NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=8"
+    "test": "HARDWARE_CONCURRENCY=${HARDWARE_CONCURRENCY:-16} RAYON_NUM_THREADS=${RAYON_NUM_THREADS:-4} NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=${JEST_MAX_WORKERS:-8}"
   },
   "inherits": [
     "../package.common.json",
diff --git a/yarn-project/archiver/package.json b/yarn-project/archiver/package.json
index 8724a38da26f..7e9a218284fa 100644
--- a/yarn-project/archiver/package.json
+++ b/yarn-project/archiver/package.json
@@ -22,7 +22,7 @@
     "clean": "rm -rf ./dest .tsbuildinfo",
     "formatting": "run -T prettier --check ./src && run -T eslint ./src",
     "formatting:fix": "run -T eslint --fix ./src && run -T prettier -w ./src",
-    "test": "HARDWARE_CONCURRENCY=16 RAYON_NUM_THREADS=4 NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=8",
+    "test": "HARDWARE_CONCURRENCY=${HARDWARE_CONCURRENCY:-16} RAYON_NUM_THREADS=${RAYON_NUM_THREADS:-4} NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=${JEST_MAX_WORKERS:-8}",
     "test:integration": "concurrently -k -s first -c reset,dim -n test,anvil \"yarn test:integration:run\" \"anvil\"",
     "test:integration:run": "NODE_NO_WARNINGS=1 node --experimental-vm-modules $(yarn bin jest) --no-cache --config jest.integration.config.json"
   },
diff --git a/yarn-project/aztec-faucet/package.json b/yarn-project/aztec-faucet/package.json
index 63e5b0d76f38..b0be9805a998 100644
--- a/yarn-project/aztec-faucet/package.json
+++ b/yarn-project/aztec-faucet/package.json
@@ -22,7 +22,7 @@
     "clean": "rm -rf ./dest .tsbuildinfo",
     "formatting": "run -T prettier --check ./src && run -T eslint ./src",
     "formatting:fix": "run -T eslint --fix ./src && run -T prettier -w ./src",
-    "test": "HARDWARE_CONCURRENCY=16 RAYON_NUM_THREADS=4 NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=8"
+    "test": "HARDWARE_CONCURRENCY=${HARDWARE_CONCURRENCY:-16} RAYON_NUM_THREADS=${RAYON_NUM_THREADS:-4} NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=${JEST_MAX_WORKERS:-8}"
   },
   "inherits": [
     "../package.common.json"
diff --git a/yarn-project/aztec-node/package.json b/yarn-project/aztec-node/package.json
index b2bc307a923f..6f7ec39ff16c 100644
--- a/yarn-project/aztec-node/package.json
+++ b/yarn-project/aztec-node/package.json
@@ -23,7 +23,7 @@
     "clean": "rm -rf ./dest .tsbuildinfo",
     "formatting": "run -T prettier --check ./src && run -T eslint ./src",
     "formatting:fix": "run -T eslint --fix ./src && run -T prettier -w ./src",
-    "test": "HARDWARE_CONCURRENCY=16 RAYON_NUM_THREADS=4 NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=8"
+    "test": "HARDWARE_CONCURRENCY=${HARDWARE_CONCURRENCY:-16} RAYON_NUM_THREADS=${RAYON_NUM_THREADS:-4} NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=${JEST_MAX_WORKERS:-8}"
   },
   "inherits": [
     "../package.common.json"
diff --git a/yarn-project/aztec.js/package.json b/yarn-project/aztec.js/package.json
index 3a3d36968cf5..a18a04002665 100644
--- a/yarn-project/aztec.js/package.json
+++ b/yarn-project/aztec.js/package.json
@@ -38,7 +38,7 @@
     "clean": "rm -rf ./dest .tsbuildinfo ./src/account_contract/artifacts",
     "formatting": "run -T prettier --check ./src && run -T eslint ./src",
     "formatting:fix": "run -T eslint --fix ./src && run -T prettier -w ./src",
-    "test": "HARDWARE_CONCURRENCY=16 RAYON_NUM_THREADS=4 NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=8"
+    "test": "HARDWARE_CONCURRENCY=${HARDWARE_CONCURRENCY:-16} RAYON_NUM_THREADS=${RAYON_NUM_THREADS:-4} NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=${JEST_MAX_WORKERS:-8}"
   },
   "inherits": [
     "../package.common.json",
diff --git a/yarn-project/aztec/package.json b/yarn-project/aztec/package.json
index d599427685ba..7ece6be545e4 100644
--- a/yarn-project/aztec/package.json
+++ b/yarn-project/aztec/package.json
@@ -21,7 +21,7 @@
     "formatting": "run -T prettier --check ./src && run -T eslint ./src",
     "formatting:fix": "run -T eslint --fix ./src && run -T prettier -w ./src",
     "build:dev": "tsc -b --watch",
-    "test": "HARDWARE_CONCURRENCY=16 RAYON_NUM_THREADS=4 NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=8",
+    "test": "HARDWARE_CONCURRENCY=${HARDWARE_CONCURRENCY:-16} RAYON_NUM_THREADS=${RAYON_NUM_THREADS:-4} NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=${JEST_MAX_WORKERS:-8}",
     "run:example:token": "LOG_LEVEL='verbose' node ./dest/examples/token.js"
   },
   "inherits": [
diff --git a/yarn-project/bb-prover/package.json b/yarn-project/bb-prover/package.json
index 1004dc1fbc95..d8ead63d6879 100644
--- a/yarn-project/bb-prover/package.json
+++ b/yarn-project/bb-prover/package.json
@@ -30,7 +30,7 @@
     "formatting": "run -T prettier --check ./src && run -T eslint ./src",
     "formatting:fix": "run -T eslint --fix ./src && run -T prettier -w ./src",
     "bb": "node --no-warnings ./dest/bb/index.js",
-    "test": "HARDWARE_CONCURRENCY=16 RAYON_NUM_THREADS=4 NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=8"
+    "test": "HARDWARE_CONCURRENCY=${HARDWARE_CONCURRENCY:-16} RAYON_NUM_THREADS=${RAYON_NUM_THREADS:-4} NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=${JEST_MAX_WORKERS:-8}"
   },
   "jest": {
     "moduleNameMapper": {
diff --git a/yarn-project/bot/package.json b/yarn-project/bot/package.json
index e8cb69769ff2..2bffdb957641 100644
--- a/yarn-project/bot/package.json
+++ b/yarn-project/bot/package.json
@@ -16,7 +16,7 @@
     "formatting": "run -T prettier --check ./src && run -T eslint ./src",
     "formatting:fix": "run -T eslint --fix ./src && run -T prettier -w ./src",
     "bb": "node --no-warnings ./dest/bb/index.js",
-    "test": "HARDWARE_CONCURRENCY=16 RAYON_NUM_THREADS=4 NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=8"
+    "test": "HARDWARE_CONCURRENCY=${HARDWARE_CONCURRENCY:-16} RAYON_NUM_THREADS=${RAYON_NUM_THREADS:-4} NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=${JEST_MAX_WORKERS:-8}"
   },
   "jest": {
     "moduleNameMapper": {
diff --git a/yarn-project/builder/package.json b/yarn-project/builder/package.json
index 9eb7841637da..4d646502b29b 100644
--- a/yarn-project/builder/package.json
+++ b/yarn-project/builder/package.json
@@ -23,7 +23,7 @@
     "clean": "rm -rf ./dest .tsbuildinfo",
     "formatting": "run -T prettier --check ./src && run -T eslint ./src",
     "formatting:fix": "run -T eslint --fix ./src && run -T prettier -w ./src",
-    "test": "HARDWARE_CONCURRENCY=16 RAYON_NUM_THREADS=4 NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=8"
+    "test": "HARDWARE_CONCURRENCY=${HARDWARE_CONCURRENCY:-16} RAYON_NUM_THREADS=${RAYON_NUM_THREADS:-4} NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=${JEST_MAX_WORKERS:-8}"
   },
   "inherits": [
     "../package.common.json"
diff --git a/yarn-project/circuit-types/package.json b/yarn-project/circuit-types/package.json
index c30dbfe249e3..7f6445ad14f9 100644
--- a/yarn-project/circuit-types/package.json
+++ b/yarn-project/circuit-types/package.json
@@ -25,7 +25,7 @@
     "clean": "rm -rf ./dest .tsbuildinfo ./src/test/artifacts",
     "formatting": "run -T prettier --check ./src && run -T eslint ./src",
     "formatting:fix": "run -T eslint --fix ./src && run -T prettier -w ./src",
-    "test": "HARDWARE_CONCURRENCY=16 RAYON_NUM_THREADS=4 NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=8",
+    "test": "HARDWARE_CONCURRENCY=${HARDWARE_CONCURRENCY:-16} RAYON_NUM_THREADS=${RAYON_NUM_THREADS:-4} NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=${JEST_MAX_WORKERS:-8}",
     "generate": "./scripts/copy-test-artifacts.sh && run -T prettier -w ./src/test/artifacts --loglevel warn"
   },
   "inherits": [
diff --git a/yarn-project/circuits.js/package.json b/yarn-project/circuits.js/package.json
index aaf5bfa4abdd..9df5971002d2 100644
--- a/yarn-project/circuits.js/package.json
+++ b/yarn-project/circuits.js/package.json
@@ -36,7 +36,7 @@
     "formatting": "run -T prettier --check ./src && run -T eslint ./src",
     "formatting:fix": "run -T eslint --fix ./src && run -T prettier -w ./src",
     "remake-constants": "node --loader ts-node/esm src/scripts/constants.in.ts && prettier -w src/constants.gen.ts && cd ../../l1-contracts && forge fmt",
-    "test": "HARDWARE_CONCURRENCY=16 RAYON_NUM_THREADS=4 NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=8"
+    "test": "HARDWARE_CONCURRENCY=${HARDWARE_CONCURRENCY:-16} RAYON_NUM_THREADS=${RAYON_NUM_THREADS:-4} NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=${JEST_MAX_WORKERS:-8}"
   },
   "dependencies": {
     "@aztec/bb.js": "portal:../../barretenberg/ts",
diff --git a/yarn-project/cli-wallet/package.json b/yarn-project/cli-wallet/package.json
index 6eb2e5709a21..ce5357341334 100644
--- a/yarn-project/cli-wallet/package.json
+++ b/yarn-project/cli-wallet/package.json
@@ -25,7 +25,7 @@
     "clean": "rm -rf ./dest .tsbuildinfo",
     "formatting": "run -T prettier --check ./src && run -T eslint ./src",
     "formatting:fix": "run -T eslint --fix ./src && run -T prettier -w ./src",
-    "test": "HARDWARE_CONCURRENCY=16 RAYON_NUM_THREADS=4 NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=8"
+    "test": "HARDWARE_CONCURRENCY=${HARDWARE_CONCURRENCY:-16} RAYON_NUM_THREADS=${RAYON_NUM_THREADS:-4} NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=${JEST_MAX_WORKERS:-8}"
   },
   "inherits": [
     "../package.common.json"
diff --git a/yarn-project/cli/package.json b/yarn-project/cli/package.json
index 91c1e0049126..cc2407f5ee50 100644
--- a/yarn-project/cli/package.json
+++ b/yarn-project/cli/package.json
@@ -27,7 +27,7 @@
     "clean": "rm -rf ./dest .tsbuildinfo",
     "formatting": "run -T prettier --check ./src && run -T eslint ./src",
     "formatting:fix": "run -T eslint --fix ./src && run -T prettier -w ./src",
-    "test": "HARDWARE_CONCURRENCY=16 RAYON_NUM_THREADS=4 NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=8"
+    "test": "HARDWARE_CONCURRENCY=${HARDWARE_CONCURRENCY:-16} RAYON_NUM_THREADS=${RAYON_NUM_THREADS:-4} NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=${JEST_MAX_WORKERS:-8}"
   },
   "inherits": [
     "../package.common.json"
diff --git a/yarn-project/entrypoints/package.json b/yarn-project/entrypoints/package.json
index e498406564d5..0614aa497f91 100644
--- a/yarn-project/entrypoints/package.json
+++ b/yarn-project/entrypoints/package.json
@@ -22,7 +22,7 @@
     "clean": "rm -rf ./dest .tsbuildinfo",
     "formatting": "run -T prettier --check ./src && run -T eslint ./src",
     "formatting:fix": "run -T eslint --fix ./src && run -T prettier -w ./src",
-    "test": "HARDWARE_CONCURRENCY=16 RAYON_NUM_THREADS=4 NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=8"
+    "test": "HARDWARE_CONCURRENCY=${HARDWARE_CONCURRENCY:-16} RAYON_NUM_THREADS=${RAYON_NUM_THREADS:-4} NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=${JEST_MAX_WORKERS:-8}"
   },
   "inherits": [
     "../package.common.json"
diff --git a/yarn-project/epoch-cache/package.json b/yarn-project/epoch-cache/package.json
index e8cb28e3330d..346af28de714 100644
--- a/yarn-project/epoch-cache/package.json
+++ b/yarn-project/epoch-cache/package.json
@@ -22,7 +22,7 @@
     "formatting:fix": "run -T eslint --fix ./src && run -T prettier -w ./src",
     "start:dev": "tsc-watch -p tsconfig.json --onSuccess 'yarn start'",
     "start": "node ./dest/index.js",
-    "test": "HARDWARE_CONCURRENCY=16 RAYON_NUM_THREADS=4 NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=8"
+    "test": "HARDWARE_CONCURRENCY=${HARDWARE_CONCURRENCY:-16} RAYON_NUM_THREADS=${RAYON_NUM_THREADS:-4} NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=${JEST_MAX_WORKERS:-8}"
   },
   "inherits": [
     "../package.common.json"
diff --git a/yarn-project/ethereum/package.json b/yarn-project/ethereum/package.json
index aa01b556c174..5770d4d4a1c0 100644
--- a/yarn-project/ethereum/package.json
+++ b/yarn-project/ethereum/package.json
@@ -22,7 +22,7 @@
     "formatting:fix": "run -T eslint --fix ./src && run -T prettier -w ./src",
     "start:dev": "tsc-watch -p tsconfig.json --onSuccess 'yarn start'",
     "start": "node ./dest/index.js",
-    "test": "HARDWARE_CONCURRENCY=16 RAYON_NUM_THREADS=4 NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=8"
+    "test": "HARDWARE_CONCURRENCY=${HARDWARE_CONCURRENCY:-16} RAYON_NUM_THREADS=${RAYON_NUM_THREADS:-4} NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=${JEST_MAX_WORKERS:-8}"
   },
   "inherits": [
     "../package.common.json"
diff --git a/yarn-project/foundation/package.json b/yarn-project/foundation/package.json
index 5f64bf309b98..7376d0c2c5ce 100644
--- a/yarn-project/foundation/package.json
+++ b/yarn-project/foundation/package.json
@@ -60,7 +60,7 @@
     "generate": "true",
     "formatting": "run -T prettier --check ./src && run -T eslint ./src",
     "formatting:fix": "run -T eslint --fix ./src && run -T prettier -w ./src",
-    "test": "HARDWARE_CONCURRENCY=16 RAYON_NUM_THREADS=4 NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=8"
+    "test": "HARDWARE_CONCURRENCY=${HARDWARE_CONCURRENCY:-16} RAYON_NUM_THREADS=${RAYON_NUM_THREADS:-4} NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=${JEST_MAX_WORKERS:-8}"
   },
   "inherits": [
     "../package.common.json"
diff --git a/yarn-project/key-store/package.json b/yarn-project/key-store/package.json
index 1cf00ec5a756..faa128e9ae1e 100644
--- a/yarn-project/key-store/package.json
+++ b/yarn-project/key-store/package.json
@@ -16,7 +16,7 @@
     "clean": "rm -rf ./dest .tsbuildinfo",
     "formatting": "run -T prettier --check ./src && run -T eslint ./src",
     "formatting:fix": "run -T eslint --fix ./src && run -T prettier -w ./src",
-    "test": "HARDWARE_CONCURRENCY=16 RAYON_NUM_THREADS=4 NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=8"
+    "test": "HARDWARE_CONCURRENCY=${HARDWARE_CONCURRENCY:-16} RAYON_NUM_THREADS=${RAYON_NUM_THREADS:-4} NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=${JEST_MAX_WORKERS:-8}"
   },
   "inherits": [
     "../package.common.json"
diff --git a/yarn-project/merkle-tree/package.json b/yarn-project/merkle-tree/package.json
index 022f1c210abf..042840916c4b 100644
--- a/yarn-project/merkle-tree/package.json
+++ b/yarn-project/merkle-tree/package.json
@@ -16,7 +16,7 @@
     "clean": "rm -rf ./dest .tsbuildinfo",
     "formatting": "run -T prettier --check ./src && run -T eslint ./src",
     "formatting:fix": "run -T eslint --fix ./src && run -T prettier -w ./src",
-    "test": "HARDWARE_CONCURRENCY=16 RAYON_NUM_THREADS=4 NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=8"
+    "test": "HARDWARE_CONCURRENCY=${HARDWARE_CONCURRENCY:-16} RAYON_NUM_THREADS=${RAYON_NUM_THREADS:-4} NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=${JEST_MAX_WORKERS:-8}"
   },
   "inherits": [
     "../package.common.json",
diff --git a/yarn-project/noir-contracts.js/package.json b/yarn-project/noir-contracts.js/package.json
index 4cb920b22f97..f37735e091b5 100644
--- a/yarn-project/noir-contracts.js/package.json
+++ b/yarn-project/noir-contracts.js/package.json
@@ -13,7 +13,7 @@
     "clean": "rm -rf ./dest .tsbuildinfo ./artifacts ./src ./codegenCache.json",
     "formatting": "run -T prettier --check ./src && run -T eslint ./src",
     "formatting:fix": "run -T eslint --fix ./src && run -T prettier -w ./src",
-    "test": "HARDWARE_CONCURRENCY=16 RAYON_NUM_THREADS=4 NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=8",
+    "test": "HARDWARE_CONCURRENCY=${HARDWARE_CONCURRENCY:-16} RAYON_NUM_THREADS=${RAYON_NUM_THREADS:-4} NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=${JEST_MAX_WORKERS:-8}",
     "generate": "yarn generate:noir-contracts",
     "generate:noir-contracts": "./scripts/generate-types.sh && run -T prettier -w ./src --loglevel warn"
   },
diff --git a/yarn-project/noir-protocol-circuits-types/package.json b/yarn-project/noir-protocol-circuits-types/package.json
index c2d868456a8a..7cf46a16e828 100644
--- a/yarn-project/noir-protocol-circuits-types/package.json
+++ b/yarn-project/noir-protocol-circuits-types/package.json
@@ -22,7 +22,7 @@
     "generate:vk-hashes": "node --no-warnings --loader ts-node/esm src/scripts/generate_vk_hashes.ts",
     "generate:noir-circuits": "node --no-warnings --loader ts-node/esm src/scripts/generate_ts_from_abi.ts && run -T prettier -w ./src/types",
     "generate:reset-data": "node --no-warnings --loader ts-node/esm src/scripts/generate_private_kernel_reset_data.ts && run -T prettier -w src/private_kernel_reset_data.ts",
-    "test": "HARDWARE_CONCURRENCY=16 RAYON_NUM_THREADS=4 NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=8",
+    "test": "HARDWARE_CONCURRENCY=${HARDWARE_CONCURRENCY:-16} RAYON_NUM_THREADS=${RAYON_NUM_THREADS:-4} NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=${JEST_MAX_WORKERS:-8}",
     "codegen": "yarn noir-codegen",
     "build:dev": "tsc -b --watch"
   },
diff --git a/yarn-project/p2p-bootstrap/package.json b/yarn-project/p2p-bootstrap/package.json
index 3ee6e5192178..516716741835 100644
--- a/yarn-project/p2p-bootstrap/package.json
+++ b/yarn-project/p2p-bootstrap/package.json
@@ -18,7 +18,7 @@
     "formatting:fix": "run -T eslint --fix ./src && run -T prettier -w ./src",
     "start:dev": "tsc-watch -p tsconfig.json --onSuccess 'yarn start'",
     "start": "node ./dest/index.js",
-    "test": "HARDWARE_CONCURRENCY=16 RAYON_NUM_THREADS=4 NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=8"
+    "test": "HARDWARE_CONCURRENCY=${HARDWARE_CONCURRENCY:-16} RAYON_NUM_THREADS=${RAYON_NUM_THREADS:-4} NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=${JEST_MAX_WORKERS:-8}"
   },
   "inherits": [
     "../package.common.json"
diff --git a/yarn-project/p2p/package.json b/yarn-project/p2p/package.json
index 8524c363ee5a..ab8a315ff48e 100644
--- a/yarn-project/p2p/package.json
+++ b/yarn-project/p2p/package.json
@@ -22,7 +22,7 @@
     "clean": "rm -rf ./dest .tsbuildinfo",
     "formatting": "run -T prettier --check ./src && run -T eslint ./src",
     "formatting:fix": "run -T eslint --fix ./src && run -T prettier -w ./src",
-    "test": "HARDWARE_CONCURRENCY=16 RAYON_NUM_THREADS=4 NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=8",
+    "test": "HARDWARE_CONCURRENCY=${HARDWARE_CONCURRENCY:-16} RAYON_NUM_THREADS=${RAYON_NUM_THREADS:-4} NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=${JEST_MAX_WORKERS:-8}",
     "start": "node ./dest",
     "start:dev": "tsc-watch -p tsconfig.json --onSuccess 'yarn start'"
   },
diff --git a/yarn-project/package.common.json b/yarn-project/package.common.json
index 270ef2d8a8a5..fec3a9a873c5 100644
--- a/yarn-project/package.common.json
+++ b/yarn-project/package.common.json
@@ -5,7 +5,7 @@
     "clean": "rm -rf ./dest .tsbuildinfo",
     "formatting": "run -T prettier --check ./src && run -T eslint ./src",
     "formatting:fix": "run -T eslint --fix ./src && run -T prettier -w ./src",
-    "test": "HARDWARE_CONCURRENCY=16 RAYON_NUM_THREADS=4 NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=8"
+    "test": "HARDWARE_CONCURRENCY=${HARDWARE_CONCURRENCY:-16} RAYON_NUM_THREADS=${RAYON_NUM_THREADS:-4} NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=${JEST_MAX_WORKERS:-8}"
   },
   "engines": {
     "node": ">=18"
diff --git a/yarn-project/proof-verifier/package.json b/yarn-project/proof-verifier/package.json
index 31d2a9d4185e..97cae4df78d4 100644
--- a/yarn-project/proof-verifier/package.json
+++ b/yarn-project/proof-verifier/package.json
@@ -11,7 +11,7 @@
     "clean": "rm -rf ./dest .tsbuildinfo",
     "formatting": "run -T prettier --check ./src && run -T eslint ./src",
     "formatting:fix": "run -T eslint --fix ./src && run -T prettier -w ./src",
-    "test": "HARDWARE_CONCURRENCY=16 RAYON_NUM_THREADS=4 NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=8"
+    "test": "HARDWARE_CONCURRENCY=${HARDWARE_CONCURRENCY:-16} RAYON_NUM_THREADS=${RAYON_NUM_THREADS:-4} NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=${JEST_MAX_WORKERS:-8}"
   },
   "engines": {
     "node": ">=18"
diff --git a/yarn-project/protocol-contracts/package.json b/yarn-project/protocol-contracts/package.json
index 6292c2878be6..c4d1a427f294 100644
--- a/yarn-project/protocol-contracts/package.json
+++ b/yarn-project/protocol-contracts/package.json
@@ -27,7 +27,7 @@
     "clean": "rm -rf ./dest .tsbuildinfo ./artifacts",
     "formatting": "run -T prettier --check ./src && run -T eslint ./src",
     "formatting:fix": "run -T eslint --fix ./src && run -T prettier -w ./src",
-    "test": "HARDWARE_CONCURRENCY=16 RAYON_NUM_THREADS=4 NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=8"
+    "test": "HARDWARE_CONCURRENCY=${HARDWARE_CONCURRENCY:-16} RAYON_NUM_THREADS=${RAYON_NUM_THREADS:-4} NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=${JEST_MAX_WORKERS:-8}"
   },
   "inherits": [
     "../package.common.json",
diff --git a/yarn-project/prover-node/package.json b/yarn-project/prover-node/package.json
index 9602fd7c5c8b..938fec1bf7b0 100644
--- a/yarn-project/prover-node/package.json
+++ b/yarn-project/prover-node/package.json
@@ -16,7 +16,7 @@
     "formatting": "run -T prettier --check ./src && run -T eslint ./src",
     "formatting:fix": "run -T eslint --fix ./src && run -T prettier -w ./src",
     "bb": "node --no-warnings ./dest/bb/index.js",
-    "test": "HARDWARE_CONCURRENCY=16 RAYON_NUM_THREADS=4 NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=8"
+    "test": "HARDWARE_CONCURRENCY=${HARDWARE_CONCURRENCY:-16} RAYON_NUM_THREADS=${RAYON_NUM_THREADS:-4} NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=${JEST_MAX_WORKERS:-8}"
   },
   "jest": {
     "moduleNameMapper": {
diff --git a/yarn-project/pxe/package.json b/yarn-project/pxe/package.json
index d955b4e0ce85..716483f57e12 100644
--- a/yarn-project/pxe/package.json
+++ b/yarn-project/pxe/package.json
@@ -23,7 +23,7 @@
     "clean": "rm -rf ./dest .tsbuildinfo ./src/config/package_info.ts",
     "formatting": "run -T prettier --check ./src && run -T eslint ./src",
     "formatting:fix": "run -T eslint --fix ./src && run -T prettier -w ./src",
-    "test": "HARDWARE_CONCURRENCY=16 RAYON_NUM_THREADS=4 NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=8",
+    "test": "HARDWARE_CONCURRENCY=${HARDWARE_CONCURRENCY:-16} RAYON_NUM_THREADS=${RAYON_NUM_THREADS:-4} NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=${JEST_MAX_WORKERS:-8}",
     "start": "LOG_LEVEL=${LOG_LEVEL:-debug} && node ./dest/bin/index.js",
     "generate": "node ./scripts/generate_package_info.js"
   },
diff --git a/yarn-project/scripts/package.json b/yarn-project/scripts/package.json
index f5c97d1fb850..3fc80b2aec76 100644
--- a/yarn-project/scripts/package.json
+++ b/yarn-project/scripts/package.json
@@ -18,7 +18,7 @@
     "formatting:fix": "run -T eslint --fix ./src && run -T prettier -w ./src",
     "start:dev": "tsc-watch -p tsconfig.json --onSuccess 'yarn start'",
     "start": "node ./dest/index.js",
-    "test": "HARDWARE_CONCURRENCY=16 RAYON_NUM_THREADS=4 NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=8",
+    "test": "HARDWARE_CONCURRENCY=${HARDWARE_CONCURRENCY:-16} RAYON_NUM_THREADS=${RAYON_NUM_THREADS:-4} NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=${JEST_MAX_WORKERS:-8}",
     "generate:noir-circuits": "echo Noop",
     "generate:noir-contracts": "echo Noop",
     "generate:l1-contracts": "echo Noop",
diff --git a/yarn-project/sequencer-client/package.json b/yarn-project/sequencer-client/package.json
index ff28366a5f8d..1ad914e4f819 100644
--- a/yarn-project/sequencer-client/package.json
+++ b/yarn-project/sequencer-client/package.json
@@ -22,7 +22,7 @@
     "clean": "rm -rf ./dest .tsbuildinfo",
     "formatting": "run -T prettier --check ./src && run -T eslint ./src",
     "formatting:fix": "run -T eslint --fix ./src && run -T prettier -w ./src",
-    "test": "HARDWARE_CONCURRENCY=16 RAYON_NUM_THREADS=4 NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=8",
+    "test": "HARDWARE_CONCURRENCY=${HARDWARE_CONCURRENCY:-16} RAYON_NUM_THREADS=${RAYON_NUM_THREADS:-4} NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=${JEST_MAX_WORKERS:-8}",
     "test:integration": "concurrently -k -s first -c reset,dim -n test,anvil \"yarn test:integration:run\" \"anvil\"",
     "test:integration:run": "NODE_NO_WARNINGS=1 node --experimental-vm-modules $(yarn bin jest) --no-cache --config jest.integration.config.json"
   },
diff --git a/yarn-project/simulator/package.json b/yarn-project/simulator/package.json
index 77bf3161e02b..487bd0ff5ffe 100644
--- a/yarn-project/simulator/package.json
+++ b/yarn-project/simulator/package.json
@@ -22,7 +22,7 @@
     "clean": "rm -rf ./dest .tsbuildinfo",
     "formatting": "run -T prettier --check ./src && run -T eslint ./src",
     "formatting:fix": "run -T eslint --fix ./src && run -T prettier -w ./src",
-    "test": "HARDWARE_CONCURRENCY=16 RAYON_NUM_THREADS=4 NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=8"
+    "test": "HARDWARE_CONCURRENCY=${HARDWARE_CONCURRENCY:-16} RAYON_NUM_THREADS=${RAYON_NUM_THREADS:-4} NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=${JEST_MAX_WORKERS:-8}"
   },
   "inherits": [
     "../package.common.json"
diff --git a/yarn-project/telemetry-client/package.json b/yarn-project/telemetry-client/package.json
index fe08f53592a2..6cad929392f3 100644
--- a/yarn-project/telemetry-client/package.json
+++ b/yarn-project/telemetry-client/package.json
@@ -16,7 +16,7 @@
     "clean": "rm -rf ./dest .tsbuildinfo",
     "formatting": "run -T prettier --check ./src && run -T eslint ./src",
     "formatting:fix": "run -T eslint --fix ./src && run -T prettier -w ./src",
-    "test": "HARDWARE_CONCURRENCY=16 RAYON_NUM_THREADS=4 NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=8"
+    "test": "HARDWARE_CONCURRENCY=${HARDWARE_CONCURRENCY:-16} RAYON_NUM_THREADS=${RAYON_NUM_THREADS:-4} NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=${JEST_MAX_WORKERS:-8}"
   },
   "engines": {
     "node": ">=18"
diff --git a/yarn-project/txe/package.json b/yarn-project/txe/package.json
index 06805e08b9d7..d17b71b05336 100644
--- a/yarn-project/txe/package.json
+++ b/yarn-project/txe/package.json
@@ -17,7 +17,7 @@
     "clean": "rm -rf ./dest .tsbuildinfo",
     "formatting": "run -T prettier --check ./src && run -T eslint ./src",
     "formatting:fix": "run -T eslint --fix ./src && run -T prettier -w ./src",
-    "test": "HARDWARE_CONCURRENCY=16 RAYON_NUM_THREADS=4 NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=8",
+    "test": "HARDWARE_CONCURRENCY=${HARDWARE_CONCURRENCY:-16} RAYON_NUM_THREADS=${RAYON_NUM_THREADS:-4} NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=${JEST_MAX_WORKERS:-8}",
     "dev": "LOG_LEVEL=debug node ./dest/bin/index.js",
     "start": "node ./dest/bin/index.js"
   },
diff --git a/yarn-project/types/package.json b/yarn-project/types/package.json
index e7c108644b28..3a2206e79578 100644
--- a/yarn-project/types/package.json
+++ b/yarn-project/types/package.json
@@ -18,7 +18,7 @@
     "clean": "rm -rf ./dest .tsbuildinfo",
     "formatting": "run -T prettier --check ./src && run -T eslint ./src",
     "formatting:fix": "run -T eslint --fix ./src && run -T prettier -w ./src",
-    "test": "HARDWARE_CONCURRENCY=16 RAYON_NUM_THREADS=4 NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=8",
+    "test": "HARDWARE_CONCURRENCY=${HARDWARE_CONCURRENCY:-16} RAYON_NUM_THREADS=${RAYON_NUM_THREADS:-4} NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=${JEST_MAX_WORKERS:-8}",
     "generate": "yarn generate:noir-contracts",
     "generate:noir-contracts": "./scripts/copy-contracts.sh"
   },
diff --git a/yarn-project/validator-client/package.json b/yarn-project/validator-client/package.json
index 8861df3557c7..8970687e0dc0 100644
--- a/yarn-project/validator-client/package.json
+++ b/yarn-project/validator-client/package.json
@@ -22,7 +22,7 @@
     "clean": "rm -rf ./dest .tsbuildinfo",
     "formatting": "run -T prettier --check ./src && run -T eslint ./src",
     "formatting:fix": "run -T eslint --fix ./src && run -T prettier -w ./src",
-    "test": "HARDWARE_CONCURRENCY=16 RAYON_NUM_THREADS=4 NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=8"
+    "test": "HARDWARE_CONCURRENCY=${HARDWARE_CONCURRENCY:-16} RAYON_NUM_THREADS=${RAYON_NUM_THREADS:-4} NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=${JEST_MAX_WORKERS:-8}"
   },
   "inherits": [
     "../package.common.json"
diff --git a/yarn-project/world-state/package.json b/yarn-project/world-state/package.json
index 57e3dc24993d..b3bdd5346c68 100644
--- a/yarn-project/world-state/package.json
+++ b/yarn-project/world-state/package.json
@@ -22,7 +22,7 @@
     "formatting": "run -T prettier --check ./src && run -T eslint ./src",
     "formatting:fix": "run -T eslint --fix ./src && run -T prettier -w ./src",
     "generate": "mkdir -p build && cp -v ../../barretenberg/cpp/build-pic/lib/world_state_napi.node build",
-    "test": "HARDWARE_CONCURRENCY=16 RAYON_NUM_THREADS=4 NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=8"
+    "test": "HARDWARE_CONCURRENCY=${HARDWARE_CONCURRENCY:-16} RAYON_NUM_THREADS=${RAYON_NUM_THREADS:-4} NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --passWithNoTests --maxWorkers=${JEST_MAX_WORKERS:-8}"
   },
   "inherits": [
     "../package.common.json",