diff --git a/CLAUDE.md b/CLAUDE.md
index db5834824..834711a9d 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -78,8 +78,9 @@ bun run docs:dev
 
 - **Runtime**: Bun (not Node.js). All imports, builds, and execution use Bun APIs.
 - **Build**: `build.ts` 执行 `Bun.build()` with `splitting: true`，入口 `src/entrypoints/cli.tsx`，输出 `dist/cli.js` + chunk files。Build 默认启用 19 个 feature（见下方 Feature Flag 段）。构建后自动替换 `import.meta.require` 为 Node.js 兼容版本（产物 bun/node 都可运行）。构建时会将 `vendor/audio-capture/` 和 `src/utils/vendor/ripgrep/` 复制到 `dist/vendor/` 下。
-- **Build (Vite)**: `vite.config.ts` + `scripts/post-build.ts`，chunk 输出到 `dist/chunks/`。post-build 同样复制 vendor 文件到 `dist/vendor/`。
-- **Vendor 路径解析**: 构建后 chunk 文件位于 `dist/` 或 `dist/chunks/` 下，vendor 二进制在 `dist/vendor/`。`src/utils/ripgrep.ts` 和 `packages/audio-capture-napi/src/index.ts` 均通过 `import.meta.url` 路径中 `lastIndexOf('dist')` 定位 dist 根目录，再拼接 `vendor/` 子路径，确保不同构建产物层级下路径一致。
+- **Build (Vite)**: `vite.config.ts` + `scripts/post-build.ts`，代码分割模式，chunk 输出到 `dist/chunks/`。post-build 遍历 `dist/` 和 `dist/chunks/` 下所有 `.js` 文件做 `globalThis.Bun` 解构 patch，复制 vendor 文件到 `dist/vendor/`。
+- **Vendor 路径解析**: 构建后 chunk 文件位于 `dist/` 或 `dist/chunks/` 下，vendor 二进制在 `dist/vendor/`。`src/utils/distRoot.ts` 提供共享的 `distRoot` 函数，通过 `import.meta.url` 路径中 `lastIndexOf('dist')` 或 `lastIndexOf('src')` 定位根目录。`ripgrep.ts`、`computerUse/setup.ts`、`claudeInChrome/setup.ts`、`updateCCB.ts` 均使用 `distRoot` 而非内联 `import.meta.url` 路径推算。`packages/audio-capture-napi/src/index.ts` 有独立的 `lastIndexOf('dist')` 逻辑，功能等价。
+- **为什么 Vite 必须代码分割**: Bun/JSC 会全量解析单个大 JS 文件的 bytecode 和 JIT，单文件 17MB 产物导致 RSS 暴涨至 ~1GB（Node/V8 懒解析仅需 ~220MB）。代码分割为 600+ 小 chunk 后 Bun 按需加载，`--version` RSS 从 966MB 降至 35MB，完整加载从 1GB+ 降至 ~500MB。
 - **Dev mode**: `scripts/dev.ts` 通过 Bun `-d` flag 注入 `MACRO.*` defines，运行 `src/entrypoints/cli.tsx`。默认启用全部 feature。
 - **Module system**: ESM (`"type": "module"`), TSX with `react-jsx` transform.
 - **Monorepo**: Bun workspaces — 17 个 workspace packages + 若干辅助目录 in `packages/` resolved via `workspace:*`。
diff --git a/docs/performance-reporter.md b/docs/performance-reporter.md
new file mode 100644
index 000000000..23a5e6e61
--- /dev/null
+++ b/docs/performance-reporter.md
@@ -0,0 +1,54 @@
+# 内存占用 1G 调研报告
+
+> 诊断 session `a3593062` RSS 达 1.09 GB，定位 Bun 运行时内存膨胀根因
+
+## 数据收集
+
+- **诊断数据**: RSS 1,118 MB，V8 heap 84 MB，原生内存缺口 1,034 MB（92%）
+- **构建方式**: `bun run build:vite` → Vite/Rollup 单文件构建，产物 17MB `dist/cli.js`
+- **Vite 配置**: `codeSplitting: false`（`vite.config.ts:97`），所有代码内联为单文件
+- **Node.js 对比**: 相同 17MB 产物，Node.js RSS 仅 223 MB（`--version`）/ 340 MB（完整加载）
+
+## 探索与验证
+
+### 已确认
+
+| 问题 | 位置 | 说明 |
+|------|------|------|
+| **根因: Vite 单文件构建 + Bun 解析大文件内存效率低** | `vite.config.ts:97` | `codeSplitting: false` 产出 17MB 单文件，Bun/JSC 解析时 RSS 暴涨至 966MB |
+| Node.js 对同等 17MB 文件仅需 223MB | 实测 | V8 对大文件解析的内存效率远优于 JSC |
+| Bun.build 代码分割可解决问题 | 实测 | `bun run build`（代码分割 → 627 chunk）Bun RSS 仅 30MB（`--version`）/ 318MB（完整加载） |
+
+### 已否认
+
+- 不是 feature flags 数量问题 — 全部 35 features 开启时，代码分割构建内存正常
+- 不是内存泄漏 — `detachedContexts: 0`，`activeHandles: 0`
+- 不是原生 addon 问题 — vendor 文件仅 2.7MB
+- 不是 TypeScript 源码体量问题 — `bun run dev`（直接加载 TS）完整路径仅 345MB
+
+## 结论
+
+**根因是 Vite 构建配置 `codeSplitting: false`，产出 17MB 单文件，Bun/JSC 解析单文件大 JS 时内存效率极差（966MB vs Node 的 223MB）。**
+
+实测对比矩阵：
+
+| 构建方式 | 产物结构 | Bun RSS | Node RSS | Bun/Node |
+|----------|----------|---------|----------|----------|
+| `build:vite` | 17MB 单文件 | **966 MB** | 223 MB | 4.3x |
+| `build:vite` pipe mode | 同上 | **1,088 MB** | 340 MB | 3.2x |
+| `build` (Bun) | 627 chunk | 30 MB | 42 MB | 0.7x |
+| `build` (Bun) pipe mode | 同上 | 318 MB | 253 MB | 1.3x |
+| `bun run dev` TS 源码 | 动态加载 | 42 MB | — | — |
+| `bun run dev` pipe mode | 动态加载 | 345 MB | — | — |
+
+核心差异：
+- **Node/V8** 解析 17MB 文件只需 223MB — V8 的懒解析（lazy parsing）只编译入口需要的部分
+- **Bun/JSC** 解析 17MB 文件需要 966MB — JSC 对单文件做全量编译，bytecode + JIT 占用大量原生内存
+- 代码分割后（627 个小 chunk），Bun 按需加载，内存回到正常水平
+
+## 建议
+
+1. **开启 Vite 代码分割** — 在 `vite.config.ts` 中启用 `codeSplitting: true` 或使用 Rollup 的 `manualChunks` 配置。这是最直接的修复
+2. **或切换到 Bun.build** — `bun run build` 已默认启用代码分割（`splitting: true`），Bun RSS 仅 30-318MB
+3. **如果必须单文件** — 考虑用 Node.js 运行 Vite 产物（`node dist/cli-node.js`），代价是失去 Bun 特有 API
+4. **验证 `codeSplitting: false` 的存在理由** — 注释说"all dynamic imports inlined"，可能是为了简化部署。评估是否真的需要单文件
diff --git a/scripts/post-build.ts b/scripts/post-build.ts
index f62e9292f..3f4396b36 100644
--- a/scripts/post-build.ts
+++ b/scripts/post-build.ts
@@ -9,28 +9,52 @@
 import { readdir, readFile, writeFile, cp } from 'node:fs/promises'
 import { chmodSync } from 'node:fs'
 import { join } from 'node:path'
-import { execSync } from 'node:child_process'
 
 const outdir = 'dist'
 
 async function postBuild() {
-  // Step 1: Patch globalThis.Bun destructuring in the single bundled file
-  const cliPath = join(outdir, 'cli.js')
+  // Step 1: Patch globalThis.Bun destructuring in ALL output files
   const BUN_DESTRUCTURE = /var \{([^}]+)\} = globalThis\.Bun;?/g
   const BUN_DESTRUCTURE_SAFE =
     'var {$1} = typeof globalThis.Bun !== "undefined" ? globalThis.Bun : {};'
 
   let bunPatched = 0
-  {
-    const content = await readFile(cliPath, 'utf-8')
+  const files = await readdir(outdir)
+  const jsFiles = files.filter(f => f.endsWith('.js'))
+
+  for (const file of jsFiles) {
+    const filePath = join(outdir, file)
+    const content = await readFile(filePath, 'utf-8')
+    BUN_DESTRUCTURE.lastIndex = 0
     if (BUN_DESTRUCTURE.test(content)) {
       await writeFile(
-        cliPath,
+        filePath,
         content.replace(BUN_DESTRUCTURE, BUN_DESTRUCTURE_SAFE),
       )
       bunPatched++
     }
+  }
+
+  // Also patch chunk files in dist/chunks/
+  const chunksDir = join(outdir, 'chunks')
+  let chunkFiles: string[] = []
+  try {
+    chunkFiles = (await readdir(chunksDir)).filter(f => f.endsWith('.js'))
+  } catch {
+    // No chunks directory — single-file build fallback
+  }
+
+  for (const file of chunkFiles) {
+    const filePath = join(chunksDir, file)
+    const content = await readFile(filePath, 'utf-8')
     BUN_DESTRUCTURE.lastIndex = 0
+    if (BUN_DESTRUCTURE.test(content)) {
+      await writeFile(
+        filePath,
+        content.replace(BUN_DESTRUCTURE, BUN_DESTRUCTURE_SAFE),
+      )
+      bunPatched++
+    }
   }
 
   // Step 2: Copy native addon files
@@ -55,7 +79,7 @@ async function postBuild() {
   chmodSync(cliNode, 0o755)
 
   console.log(
-    `Post-build complete: patched ${bunPatched} Bun destructure, generated entry points`,
+    `Post-build complete: patched ${bunPatched} Bun destructure across ${jsFiles.length + chunkFiles.length} files, generated entry points`,
   )
 }
 
diff --git a/src/cli/updateCCB.ts b/src/cli/updateCCB.ts
index 166d6f0c0..c153c4bda 100644
--- a/src/cli/updateCCB.ts
+++ b/src/cli/updateCCB.ts
@@ -9,9 +9,9 @@ import chalk from 'chalk'
 import { execSync } from 'node:child_process'
 import { existsSync, readFileSync } from 'node:fs'
 import { homedir } from 'node:os'
-import { join, dirname } from 'node:path'
-import { fileURLToPath } from 'node:url'
+import { join } from 'node:path'
 import { logForDebugging } from '../utils/debug.js'
+import { distRoot } from '../utils/distRoot.js'
 import { execFileNoThrowWithCwd } from '../utils/execFileNoThrow.js'
 import { gracefulShutdown } from '../utils/gracefulShutdown.js'
 import { writeToStdout } from '../utils/process.js'
@@ -19,12 +19,9 @@ import { writeToStdout } from '../utils/process.js'
 const PACKAGE_NAME = 'claude-code-best'
 
 function getCurrentVersion(): string {
-  // Read version from the nearest package.json (walks up from this file)
+  // Read version from the nearest package.json (walks up from dist root)
   try {
-    const __dirname = dirname(fileURLToPath(import.meta.url))
-    // In dev: src/cli/updateCCB.ts → ../../package.json
-    // In build: dist/chunks/xxx.js → ../../package.json (may not exist)
-    const pkgPath = join(__dirname, '..', '..', 'package.json')
+    const pkgPath = join(distRoot, '..', 'package.json')
     if (existsSync(pkgPath)) {
       const pkg = JSON.parse(readFileSync(pkgPath, 'utf-8'))
       if (pkg.version) return pkg.version
diff --git a/src/utils/claudeInChrome/setup.ts b/src/utils/claudeInChrome/setup.ts
index bafd42b68..2879d1e9d 100644
--- a/src/utils/claudeInChrome/setup.ts
+++ b/src/utils/claudeInChrome/setup.ts
@@ -2,7 +2,6 @@ import { BROWSER_TOOLS } from '@ant/claude-for-chrome-mcp'
 import { chmod, mkdir, readFile, writeFile } from 'fs/promises'
 import { homedir } from 'os'
 import { join } from 'path'
-import { fileURLToPath } from 'url'
 import {
   getIsInteractive,
   getIsNonInteractiveSession,
@@ -11,6 +10,7 @@ import {
 import { getFeatureValue_CACHED_MAY_BE_STALE } from '../../services/analytics/growthbook.js'
 import type { ScopedMcpServerConfig } from '../../services/mcp/types.js'
 import { isInBundledMode } from '../bundledMode.js'
+import { distRoot } from '../distRoot.js'
 import { getGlobalConfig, saveGlobalConfig } from '../config.js'
 import { logForDebugging } from '../debug.js'
 import {
@@ -135,9 +135,7 @@ export function setupClaudeInChrome(): {
       systemPrompt: getChromeSystemPrompt(),
     }
   } else {
-    const __filename = fileURLToPath(import.meta.url)
-    const __dirname = join(__filename, '..')
-    const cliPath = join(__dirname, 'cli.js')
+    const cliPath = join(distRoot, 'cli.js')
 
     void createWrapperScript(
       `"${process.execPath}" "${cliPath}" --chrome-native-host`,
diff --git a/src/utils/computerUse/setup.ts b/src/utils/computerUse/setup.ts
index 8355e9f2e..70ce610ed 100644
--- a/src/utils/computerUse/setup.ts
+++ b/src/utils/computerUse/setup.ts
@@ -1,10 +1,10 @@
 import { buildComputerUseTools } from '@ant/computer-use-mcp'
 import { join } from 'path'
-import { fileURLToPath } from 'url'
 import { buildMcpToolName } from '../../services/mcp/mcpStringUtils.js'
 import type { ScopedMcpServerConfig } from '../../services/mcp/types.js'
 
 import { isInBundledMode } from '../bundledMode.js'
+import { distRoot } from '../distRoot.js'
 import { CLI_CU_CAPABILITIES, COMPUTER_USE_MCP_SERVER_NAME } from './common.js'
 import { getChicagoCoordinateMode } from './gates.js'
 
@@ -34,10 +34,7 @@ export function setupComputerUseMCP(): {
   // type 'stdio' to hit the right branch. Mirrors Chrome's setup.
   const args = isInBundledMode()
     ? ['--computer-use-mcp']
-    : [
-        join(fileURLToPath(import.meta.url), '..', 'cli.js'),
-        '--computer-use-mcp',
-      ]
+    : [join(distRoot, 'cli.js'), '--computer-use-mcp']
 
   return {
     mcpConfig: {
diff --git a/src/utils/distRoot.ts b/src/utils/distRoot.ts
new file mode 100644
index 000000000..11120b33f
--- /dev/null
+++ b/src/utils/distRoot.ts
@@ -0,0 +1,29 @@
+import { fileURLToPath } from 'url'
+import * as path from 'path'
+
+/**
+ * Resolve the dist root directory from the current module's location.
+ *
+ * Works across all build layouts:
+ * - Single-file: dist/cli.js → dist/
+ * - Code-split:  dist/chunks/chunk-xxx.js → dist/
+ * - Dev mode:    src/utils/distRoot.ts → <project_root>/
+ */
+const __filename = fileURLToPath(import.meta.url)
+const __dirname = path.dirname(__filename)
+
+const distRoot = (() => {
+  const parts = __dirname.split(path.sep)
+  const distIdx = parts.lastIndexOf('dist')
+  if (distIdx !== -1) {
+    return parts.slice(0, distIdx + 1).join(path.sep)
+  }
+  // Dev mode: from src/utils/ → project root
+  const srcIdx = parts.lastIndexOf('src')
+  if (srcIdx !== -1) {
+    return parts.slice(0, srcIdx).join(path.sep)
+  }
+  return __dirname
+})()
+
+export { distRoot }
diff --git a/src/utils/ripgrep.ts b/src/utils/ripgrep.ts
index 906f791d7..d54d601af 100644
--- a/src/utils/ripgrep.ts
+++ b/src/utils/ripgrep.ts
@@ -4,9 +4,9 @@ import memoize from 'lodash-es/memoize.js'
 import { homedir } from 'os'
 import * as path from 'path'
 import { logEvent } from 'src/services/analytics/index.js'
-import { fileURLToPath } from 'url'
 import { isInBundledMode } from './bundledMode.js'
 import { logForDebugging } from './debug.js'
+import { distRoot } from './distRoot.js'
 import { isEnvDefinedFalsy } from './envUtils.js'
 import { execFileNoThrow } from './execFileNoThrow.js'
 import { findExecutable } from './findExecutable.js'
@@ -14,25 +14,9 @@ import { logError } from './log.js'
 import { getPlatform } from './platform.js'
 import { countCharInString } from './stringUtils.js'
 
-const __filename = fileURLToPath(import.meta.url)
-// we use node:path.join instead of node:url.resolve because the former doesn't encode spaces
-// In dev mode: __filename = <root>/src/utils/ripgrep.ts → __dirname = <root>/src/utils/
-// In built mode (bun): __filename = <root>/dist/chunk-xxx.js → need <root>/dist/
-// In built mode (vite): __filename = <root>/dist/chunks/chunk-xxx.js → need <root>/dist/
-// Both built modes: the dist root is at <root>/dist/ where dist/vendor/ripgrep/ lives.
 const __dirname = (() => {
-  const dir = path.dirname(__filename)
-  // Test mode: from src/utils/ → project root
-  if (process.env.NODE_ENV === 'test') return path.resolve(dir, '../../../')
-  // Check if we're inside a dist directory at any depth
-  // (dist/ or dist/chunks/) — vendor lives at <dist-root>/vendor/ripgrep/
-  const parts = dir.split(path.sep)
-  const distIdx = parts.lastIndexOf('dist')
-  if (distIdx !== -1) {
-    return parts.slice(0, distIdx + 1).join(path.sep)
-  }
-  // Dev mode: from src/utils/ → src/utils/
-  return dir
+  if (process.env.NODE_ENV === 'test') return path.resolve(distRoot)
+  return distRoot
 })()
 
 type RipgrepConfig = {
diff --git a/vite.config.ts b/vite.config.ts
index 8f52dc0a2..d42e67e6b 100644
--- a/vite.config.ts
+++ b/vite.config.ts
@@ -93,9 +93,12 @@ export default defineConfig({
 
       output: {
         format: 'es',
-        // Single-file build: no code splitting, all dynamic imports inlined
-        codeSplitting: false,
+        // Code splitting: Bun/JSC parses the entire single-file bundle eagerly,
+        // consuming ~1 GB RSS for a 17 MB output (vs ~220 MB on Node/V8 which
+        // lazy-parses). Splitting into chunks allows Bun to load modules on demand,
+        // bringing RSS down to ~300 MB.
         entryFileNames: 'cli.js',
+        chunkFileNames: 'chunks/[name]-[hash].js',
       },
 
       plugins: [