diff --git a/package.json b/package.json
index 12f1159e639..2d3af0f27d2 100644
--- a/package.json
+++ b/package.json
@@ -22,6 +22,8 @@
     "test-dts": "run-s build-dts test-dts-only",
     "test-dts-only": "tsc -p packages-private/dts-built-test/tsconfig.json && tsc -p ./packages-private/dts-test/tsconfig.test.json",
     "test-coverage": "vitest run --project unit --coverage",
+    "prebench": "node scripts/build.js -pf esm-browser reactivity",
+    "prebench-compare": "node scripts/build.js -pf esm-browser reactivity",
     "bench": "vitest bench --project=unit --outputJson=temp/bench.json",
     "bench-compare": "vitest bench --project=unit --compare=temp/bench.json",
     "release": "node scripts/release.js",
diff --git a/packages/reactivity/__benchmarks__/computed.bench.ts b/packages/reactivity/__benchmarks__/computed.bench.ts
index d9757501f81..a2a49486a89 100644
--- a/packages/reactivity/__benchmarks__/computed.bench.ts
+++ b/packages/reactivity/__benchmarks__/computed.bench.ts
@@ -1,5 +1,10 @@
 import { bench, describe } from 'vitest'
-import { type ComputedRef, type Ref, computed, effect, ref } from '../src'
+import type { ComputedRef, Ref } from '../src'
+import { computed, effect, ref } from '../dist/reactivity.esm-browser.prod'
+
+declare module '../dist/reactivity.esm-browser.prod' {
+  function computed(...args: any[]): any
+}
 
 describe('computed', () => {
   bench('create computed', () => {
diff --git a/packages/reactivity/__benchmarks__/effect.bench.ts b/packages/reactivity/__benchmarks__/effect.bench.ts
index 8d3d6ecfbfc..a1026db2153 100644
--- a/packages/reactivity/__benchmarks__/effect.bench.ts
+++ b/packages/reactivity/__benchmarks__/effect.bench.ts
@@ -1,5 +1,6 @@
 import { bench, describe } from 'vitest'
-import { type Ref, effect, ref } from '../src'
+import type { Ref } from '../src'
+import { effect, ref } from '../dist/reactivity.esm-browser.prod'
 
 describe('effect', () => {
   {
diff --git a/packages/reactivity/__benchmarks__/reactiveArray.bench.ts b/packages/reactivity/__benchmarks__/reactiveArray.bench.ts
index f5032cf7ae9..910c10015e9 100644
--- a/packages/reactivity/__benchmarks__/reactiveArray.bench.ts
+++ b/packages/reactivity/__benchmarks__/reactiveArray.bench.ts
@@ -1,5 +1,9 @@
 import { bench } from 'vitest'
-import { effect, reactive, shallowReadArray } from '../src'
+import {
+  effect,
+  reactive,
+  shallowReadArray,
+} from '../dist/reactivity.esm-browser.prod'
 
 for (let amount = 1e1; amount < 1e4; amount *= 10) {
   {
diff --git a/packages/reactivity/__benchmarks__/reactiveMap.bench.ts b/packages/reactivity/__benchmarks__/reactiveMap.bench.ts
index f8b4611153e..5af03ba4b14 100644
--- a/packages/reactivity/__benchmarks__/reactiveMap.bench.ts
+++ b/packages/reactivity/__benchmarks__/reactiveMap.bench.ts
@@ -1,5 +1,6 @@
 import { bench } from 'vitest'
-import { type ComputedRef, computed, reactive } from '../src'
+import type { ComputedRef } from '../src'
+import { computed, reactive } from '../dist/reactivity.esm-browser.prod'
 
 function createMap(obj: Record<string, any>) {
   const map = new Map()
diff --git a/packages/reactivity/__benchmarks__/reactiveObject.bench.ts b/packages/reactivity/__benchmarks__/reactiveObject.bench.ts
index a326a111b49..1b444d4fec6 100644
--- a/packages/reactivity/__benchmarks__/reactiveObject.bench.ts
+++ b/packages/reactivity/__benchmarks__/reactiveObject.bench.ts
@@ -1,5 +1,5 @@
 import { bench } from 'vitest'
-import { reactive } from '../src'
+import { reactive } from '../dist/reactivity.esm-browser.prod'
 
 bench('create reactive obj', () => {
   reactive({ a: 1 })
diff --git a/packages/reactivity/__benchmarks__/ref.bench.ts b/packages/reactivity/__benchmarks__/ref.bench.ts
index 0c05890179b..4c1d2b5b82f 100644
--- a/packages/reactivity/__benchmarks__/ref.bench.ts
+++ b/packages/reactivity/__benchmarks__/ref.bench.ts
@@ -1,5 +1,5 @@
 import { bench, describe } from 'vitest'
-import { ref } from '../src/index'
+import { ref } from '../dist/reactivity.esm-browser.prod'
 
 describe('ref', () => {
   bench('create ref', () => {
diff --git a/packages/server-renderer/__tests__/createBuffer.bench.ts b/packages/server-renderer/__tests__/createBuffer.bench.ts
index fff20f927fb..002626d9e12 100644
--- a/packages/server-renderer/__tests__/createBuffer.bench.ts
+++ b/packages/server-renderer/__tests__/createBuffer.bench.ts
@@ -1,6 +1,10 @@
 import { bench, describe } from 'vitest'
 
-import { createBuffer } from '../src/render'
+import { createBuffer as _createBuffer } from '../src/render'
+
+// move to local const to avoid import access overhead
+// https://github.com/vitest-dev/vitest/issues/6903
+const createBuffer = _createBuffer
 
 describe('createBuffer', () => {
   let stringBuffer = createBuffer()
diff --git a/packages/server-renderer/__tests__/unrollBuffer.bench.ts b/packages/server-renderer/__tests__/unrollBuffer.bench.ts
index b5e03cea602..b26ab9b28ef 100644
--- a/packages/server-renderer/__tests__/unrollBuffer.bench.ts
+++ b/packages/server-renderer/__tests__/unrollBuffer.bench.ts
@@ -1,7 +1,11 @@
 import { bench, describe } from 'vitest'
 
 import { type SSRBuffer, createBuffer } from '../src/render'
-import { unrollBuffer } from '../src/renderToString'
+import { unrollBuffer as _unrollBuffer } from '../src/renderToString'
+
+// move to local const to avoid import access overhead
+// https://github.com/vitest-dev/vitest/issues/6903
+const unrollBuffer = _unrollBuffer
 
 function createSyncBuffer(levels: number, itemsPerLevel: number): SSRBuffer {
   const buffer = createBuffer()