diff --git a/config/config.go b/config/config.go
index 4204aaddf1..a180a9a479 100644
--- a/config/config.go
+++ b/config/config.go
@@ -77,6 +77,10 @@ const ParticipationRegistryFilename = "partregistry.sqlite"
 // built-in supported consensus protocols.
 const ConfigurableConsensusProtocolsFilename = "consensus.json"
 
+// The default gossip fanout setting when configured as a relay (here, as we
+// do not expose in normal config so it is not in code generated local_defaults.go
+const defaultRelayGossipFanout = 8
+
 // LoadConfigFromDisk returns a Local config structure based on merging the defaults
 // with settings loaded from the config file from the custom dir.  If the custom file
 // cannot be loaded, the default config is returned (with the error from loading the
@@ -124,6 +128,12 @@ func mergeConfigFromFile(configpath string, source Local) (Local, error) {
 		source.Archival = true
 		source.EnableLedgerService = true
 		source.EnableBlockService = true
+
+		// If gossip fanout has not been explicitly overridden, use defaultRelayGossipFanout
+		// rather then the default gossip fanout setting from defaultLocal
+		if source.GossipFanout == defaultLocal.GossipFanout {
+			source.GossipFanout = defaultRelayGossipFanout
+		}
 	}
 
 	return source, err
diff --git a/config/localTemplate.go b/config/localTemplate.go
index 4be9e300fe..a1779e086f 100644
--- a/config/localTemplate.go
+++ b/config/localTemplate.go
@@ -459,13 +459,13 @@ type Local struct {
 	MaxAPIResourcesPerAccount uint64 `version[21]:"100000"`
 
 	// AgreementIncomingVotesQueueLength sets the size of the buffer holding incoming votes.
-	AgreementIncomingVotesQueueLength uint64 `version[21]:"10000"`
+	AgreementIncomingVotesQueueLength uint64 `version[21]:"10000" version[27]:"20000"`
 
 	// AgreementIncomingProposalsQueueLength sets the size of the buffer holding incoming proposals.
-	AgreementIncomingProposalsQueueLength uint64 `version[21]:"25"`
+	AgreementIncomingProposalsQueueLength uint64 `version[21]:"25" version[27]:"50"`
 
 	// AgreementIncomingBundlesQueueLength sets the size of the buffer holding incoming bundles.
-	AgreementIncomingBundlesQueueLength uint64 `version[21]:"7"`
+	AgreementIncomingBundlesQueueLength uint64 `version[21]:"7" version[27]:"15"`
 
 	// MaxAcctLookback sets the maximum lookback range for account states,
 	// i.e. the ledger can answer account states questions for the range Latest-MaxAcctLookback...Latest
diff --git a/config/local_defaults.go b/config/local_defaults.go
index b9a993631f..7066a30fca 100644
--- a/config/local_defaults.go
+++ b/config/local_defaults.go
@@ -23,9 +23,9 @@ var defaultLocal = Local{
 	Version:                                    27,
 	AccountUpdatesStatsInterval:                5000000000,
 	AccountsRebuildSynchronousMode:             1,
-	AgreementIncomingBundlesQueueLength:        7,
-	AgreementIncomingProposalsQueueLength:      25,
-	AgreementIncomingVotesQueueLength:          10000,
+	AgreementIncomingBundlesQueueLength:        15,
+	AgreementIncomingProposalsQueueLength:      50,
+	AgreementIncomingVotesQueueLength:          20000,
 	AnnounceParticipationKey:                   true,
 	Archival:                                   false,
 	BaseLoggerDebugLevel:                       4,
diff --git a/installer/config.json.example b/installer/config.json.example
index 59150b031b..997f3412c4 100644
--- a/installer/config.json.example
+++ b/installer/config.json.example
@@ -2,9 +2,9 @@
     "Version": 27,
     "AccountUpdatesStatsInterval": 5000000000,
     "AccountsRebuildSynchronousMode": 1,
-    "AgreementIncomingBundlesQueueLength": 7,
-    "AgreementIncomingProposalsQueueLength": 25,
-    "AgreementIncomingVotesQueueLength": 10000,
+    "AgreementIncomingBundlesQueueLength": 15,
+    "AgreementIncomingProposalsQueueLength": 50,
+    "AgreementIncomingVotesQueueLength": 20000,
     "AnnounceParticipationKey": true,
     "Archival": false,
     "BaseLoggerDebugLevel": 4,
diff --git a/test/testdata/configs/config-v27.json b/test/testdata/configs/config-v27.json
index 375c6f8712..997f3412c4 100644
--- a/test/testdata/configs/config-v27.json
+++ b/test/testdata/configs/config-v27.json
@@ -2,9 +2,9 @@
     "Version": 27,
     "AccountUpdatesStatsInterval": 5000000000,
     "AccountsRebuildSynchronousMode": 1,
-    "AgreementIncomingBundlesQueueLength": 7,
-    "AgreementIncomingProposalsQueueLength": 25,
-    "AgreementIncomingVotesQueueLength": 10000,
+    "AgreementIncomingBundlesQueueLength": 15,
+    "AgreementIncomingProposalsQueueLength": 50,
+    "AgreementIncomingVotesQueueLength": 20000,
     "AnnounceParticipationKey": true,
     "Archival": false,
     "BaseLoggerDebugLevel": 4,
@@ -51,7 +51,6 @@
     "EnableRuntimeMetrics": false,
     "EnableTopAccountsReporting": false,
     "EnableTxBacklogRateLimiting": false,
-    "TxBacklogSize": 26000,
     "EnableUsageLog": false,
     "EnableVerbosedTransactionSyncLogging": false,
     "EndpointAddress": "127.0.0.1:0",
@@ -68,9 +67,9 @@
     "LogArchiveMaxAge": "",
     "LogArchiveName": "node.archive.log",
     "LogSizeLimit": 1073741824,
-    "MaxAcctLookback": 4,
     "MaxAPIBoxPerApplication": 100000,
     "MaxAPIResourcesPerAccount": 100000,
+    "MaxAcctLookback": 4,
     "MaxCatchpointDownloadDuration": 7200000000000,
     "MaxConnectionsPerIP": 30,
     "MinCatchpointFileDownloadBytesPerSecond": 20480,
@@ -97,13 +96,14 @@
     "RunHosted": false,
     "SuggestedFeeBlockHistory": 3,
     "SuggestedFeeSlidingWindowSize": 50,
-    "TelemetryToLog": true,
     "TLSCertFile": "",
     "TLSKeyFile": "",
+    "TelemetryToLog": true,
     "TransactionSyncDataExchangeRate": 0,
     "TransactionSyncSignificantMessageThreshold": 0,
-    "TxBacklogServiceRateWindowSeconds": 10,
     "TxBacklogReservedCapacityPerPeer": 20,
+    "TxBacklogServiceRateWindowSeconds": 10,
+    "TxBacklogSize": 26000,
     "TxIncomingFilteringFlags": 1,
     "TxPoolExponentialIncreaseFactor": 2,
     "TxPoolSize": 75000,