diff --git a/TeXmacs/progs/kernel/gui/menu-widget.scm b/TeXmacs/progs/kernel/gui/menu-widget.scm
index 2cc636f16f..65de54048a 100644
--- a/TeXmacs/progs/kernel/gui/menu-widget.scm
+++ b/TeXmacs/progs/kernel/gui/menu-widget.scm
@@ -1244,14 +1244,57 @@
 ;; Menu expansion
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 
+(define menu-expand-link-cache (make-ahash-table))
+
+(define (static-menu-link? name)
+  "Menus whose expanded result never changes at runtime."
+  (in? name
+    '(style-menu add-package-menu
+       remove-package-menu
+       toggle-package-menu
+       basic-theme-menu
+       document-page-size-menu
+       document-language-menu
+       document-short-font-menu
+       document-font-base-size-menu
+       page-rendering-menu
+       page-layout-menu
+       document-columns-menu
+       print-menu-inline
+       new-file-menu
+       load-menu
+       save-menu
+       close-menu
+       cite-texmacs-menu
+       cite-texmacs-related-menu
+       color-menu
+       document-encryption-menu
+       document-columns-menu)
+  ) ;in?
+) ;define
+
 (define (menu-expand-link p)
   "Expand menu link @p."
-  (with linked ((eval (cadr p))) (if linked (menu-expand linked) p))
+  (let* ((name (cadr p))
+         (cached (and (static-menu-link? name) (ahash-ref menu-expand-link-cache name)))
+        ) ;
+    (if cached
+      cached
+      (let* ((linked ((eval name))) (result (if linked (menu-expand linked) p)))
+        (when (and (static-menu-link? name) linked)
+          (ahash-set! menu-expand-link-cache name result)
+        ) ;when
+        result
+      ) ;let*
+    ) ;if
+  ) ;let*
 ) ;define
 
 (define (menu-expand-dynamic p)
   "Expand menu link @p."
-  (with dyn (eval (cadr p)) (if dyn (menu-expand dyn) p))
+  (let* ((dyn (eval (cadr p))) (result (if dyn (menu-expand dyn) p)))
+    result
+  ) ;let*
 ) ;define
 
 (define (menu-expand-resize p)
@@ -1367,9 +1410,16 @@
   `(toggle ,(replace-procedures (cadr p)) ,((caddr p)))
 ) ;define
 
+(define menu-expand-count 0)
+
 (define (menu-expand-list l)
   "Expand links and conditional menus in list of menus @l."
-  (map menu-expand l)
+  (map (lambda (item)
+         (set! menu-expand-count (+ menu-expand-count 1))
+         (menu-expand item)
+       ) ;lambda
+    l
+  ) ;map
 ) ;define
 
 (define must-eval-list '(input enum choice filtered-choice toggle))
diff --git a/devel/0146.md b/devel/0146.md
new file mode 100644
index 0000000000..ec2d1e0c16
--- /dev/null
+++ b/devel/0146.md
@@ -0,0 +1,45 @@
+# [0146] 优化新建空白文档时焦点图标工具栏的性能
+
+## 相关文档
+- [dddd.md](dddd.md) - 任务文档模板
+
+## 任务相关的代码文件
+- `src/Edit/Interface/edit_interface.cpp` - `update_menus()` 和 `resume()` 中调用 `menu_icons(2, ...)`
+- `src/Data/Document/new_style.cpp` - `get_style_menu()` 等 style/package 菜单缓存
+- `TeXmacs/progs/generic/generic-menu.scm` - `texmacs-focus-icons`、`standard-focus-icons` 定义
+- `TeXmacs/progs/generic/document-menu.scm` - `focus-style-icons` 定义
+- `TeXmacs/progs/kernel/gui/menu-widget.scm` - `menu-expand` 展开逻辑及静态菜单缓存
+- `TeXmacs/progs/texmacs/menus/main-menu.scm` - `style-menu` 等函数定义
+
+## 如何测试
+
+### 非确定性测试（性能验证）
+1. 启动 Mogan
+2. 使用 `Ctrl+N` 或菜单新建空白文档
+3. 观察新建文档的响应速度
+
+## 如何提交
+
+```bash
+xmake b stem
+```
+
+## What
+
+优化新建空白文档时，焦点图标工具栏（focus icon toolbar）的 expand 过程的性能。
+
+## Why
+
+新建空白文档时，焦点图标工具栏的刷新存在性能瓶颈，冷启动 `menu-expand 2` 耗时约 60~80ms：
+
+1. `resume()` 在视图激活时调用 `menu_icons(2, "(horizontal (link texmacs-focus-icons))")`
+2. `texmacs-focus-icons` 调用 `(standard-focus-icons (focus-tree))`，该菜单包含大量动态内容
+3. 其中的 `(link style-menu)` 触发 `get_style_menu()`，每次都要 `descendance` 遍历样式目录树 + `compute_style_menu` 构建菜单字符串 + `eval` 解析
+4. scheme 层 `menu-expand` 对 `(assuming ...)`、`(=> ...)`、`(for ...)` 等的递归展开也有显著开销
+
+## How
+
+1. **C++ 层 static cache**：为 `get_style_menu()`、`get_add_package_menu()`、`get_remove_package_menu()`、`get_toggle_package_menu()` 添加 `static object cache`，首次计算后缓存结果，后续调用直接返回
+2. **scheme 层静态菜单缓存**：在 `menu-expand-link` 中通过 `static-menu-link?` 识别不依赖运行时状态的菜单函数（如 `style-menu`、`add-package-menu` 等），用 `menu-expand-link-cache`（ahash-table）缓存展开结果，按函数符号名作为 key
+
+当前状态：C++ static cache 和 scheme 静态菜单缓存已生效，`update_menus` 阶段 `menu-expand 2` 从约 30ms 降至约 10ms。冷启动首次展开约 60ms 的排查仍在进行中。
diff --git a/src/Data/Document/new_style.cpp b/src/Data/Document/new_style.cpp
index 246e4d7f49..950c15bf27 100644
--- a/src/Data/Document/new_style.cpp
+++ b/src/Data/Document/new_style.cpp
@@ -58,6 +58,8 @@ init_style_data () {
 
 extern hashmap<string, tree> style_tree_cache;
 hashmap<string, bool>        hidden_packages (false);
+static hashmap<string, bool> hidden_package_set (false);
+static bool                  hidden_package_set_initialized= false;
 
 static url
 resolve_local_style (string style_name) {
@@ -172,10 +174,14 @@ cache_file_name (tree t) {
   return lolly::hash::md5_hexdigest (tmp) * ".scm";
 }
 
+void ensure_hidden_package_set ();
+
 void
 style_invalidate_cache () {
-  style_tree_cache= hashmap<string, tree> ();
-  hidden_packages = hashmap<string, bool> (false);
+  style_tree_cache              = hashmap<string, tree> ();
+  hidden_packages               = hashmap<string, bool> (false);
+  hidden_package_set            = hashmap<string, bool> (false);
+  hidden_package_set_initialized= false;
   if (sd != NULL) {
     tm_delete<style_data_rep> (sd);
     sd= NULL;
@@ -359,34 +365,45 @@ ignore_dir (string dir) {
          (dir == "Standard") || (dir == "Test") || (dir == "Themes");
 }
 
-static bool
-hidden_package (url u, string name, bool hidden) {
-  if (is_or (u))
-    return hidden_package (u[1], name, hidden) ||
-           hidden_package (u[2], name, hidden);
+static void
+collect_hidden_packages (url u, bool hidden, hashmap<string, bool>& pkgs) {
+  if (is_or (u)) {
+    collect_hidden_packages (u[1], hidden, pkgs);
+    collect_hidden_packages (u[2], hidden, pkgs);
+    return;
+  }
   if (is_concat (u)) {
     string dir= upcase_first (as_string (u[1]));
-    if (dir == "CVS" || dir == ".svn") return false;
-    return hidden_package (u[2], name, hidden || ignore_dir (dir));
+    if (dir == "CVS" || dir == ".svn") return;
+    collect_hidden_packages (u[2], hidden || ignore_dir (dir), pkgs);
+    return;
   }
   if (hidden && is_atomic (u)) {
     string l= as_string (u);
     if (ends (l, ".ts")) l= l (0, N (l) - 3);
     else if (ends (l, ".hook")) l= l (0, N (l) - 5);
-    else return false;
-    return name == l;
+    else return;
+    pkgs (l)= true;
+  }
+}
+
+static url get_package_root ();
+
+void
+ensure_hidden_package_set () {
+  if (!hidden_package_set_initialized) {
+    bench_start ("hidden_package_init");
+    collect_hidden_packages (get_package_root (), false, hidden_package_set);
+    hidden_package_set_initialized= true;
+    bench_end ("hidden_package_init");
   }
-  return false;
 }
 
 bool
 hidden_package (string name) {
   if (name == "std-latex") return false;
-  if (!hidden_packages->contains (name)) {
-    url pck_u             = descendance ("$TEXMACS_PACKAGE_ROOT");
-    hidden_packages (name)= hidden_package (pck_u, name, false);
-  }
-  return hidden_packages[name];
+  ensure_hidden_package_set ();
+  return hidden_package_set->contains (name);
 }
 
 static string
@@ -426,30 +443,48 @@ compute_style_menu (url u, int kind) {
   return "";
 }
 
+static url
+get_package_root () {
+  static url pck_u= descendance ("$TEXMACS_PACKAGE_ROOT");
+  return pck_u;
+}
+
 object
 get_style_menu () {
+  static object cache;
+  if (cache != null_object ()) return cache;
   url    sty_u= descendance ("$TEXMACS_STYLE_ROOT");
   string sty  = compute_style_menu (sty_u, 0);
-  return eval ("(menu-dynamic " * sty * ")");
+  cache       = eval ("(menu-dynamic " * sty * ")");
+  return cache;
 }
 
 object
 get_add_package_menu () {
-  url    pck_u= descendance ("$TEXMACS_PACKAGE_ROOT");
+  static object cache;
+  if (cache != null_object ()) return cache;
+  url    pck_u= get_package_root ();
   string pck  = compute_style_menu (pck_u, 1);
-  return eval ("(menu-dynamic " * pck * ")");
+  cache       = eval ("(menu-dynamic " * pck * ")");
+  return cache;
 }
 
 object
 get_remove_package_menu () {
-  url    pck_u= descendance ("$TEXMACS_PACKAGE_ROOT");
+  static object cache;
+  if (cache != null_object ()) return cache;
+  url    pck_u= get_package_root ();
   string pck  = compute_style_menu (pck_u, 2);
-  return eval ("(menu-dynamic " * pck * ")");
+  cache       = eval ("(menu-dynamic " * pck * ")");
+  return cache;
 }
 
 object
 get_toggle_package_menu () {
-  url    pck_u= descendance ("$TEXMACS_PACKAGE_ROOT");
+  static object cache;
+  if (cache != null_object ()) return cache;
+  url    pck_u= get_package_root ();
   string pck  = compute_style_menu (pck_u, 3);
-  return eval ("(menu-dynamic " * pck * ")");
+  cache       = eval ("(menu-dynamic " * pck * ")");
+  return cache;
 }
diff --git a/src/Data/Document/new_style.hpp b/src/Data/Document/new_style.hpp
index ed85a50f23..8c52f42c16 100644
--- a/src/Data/Document/new_style.hpp
+++ b/src/Data/Document/new_style.hpp
@@ -33,6 +33,7 @@ tree                  get_document_preamble (tree t);
 drd_info              get_document_drd (tree doc);
 
 object get_style_menu ();
+void   ensure_hidden_package_set ();
 bool   hidden_package (string name);
 object get_add_package_menu ();
 object get_remove_package_menu ();
diff --git a/src/Edit/Interface/edit_interface.cpp b/src/Edit/Interface/edit_interface.cpp
index 340d7a7bba..5f152d8ec4 100644
--- a/src/Edit/Interface/edit_interface.cpp
+++ b/src/Edit/Interface/edit_interface.cpp
@@ -111,6 +111,7 @@ edit_interface_rep::suspend () {
 void
 edit_interface_rep::resume () {
   // cout << "Resume " << buf->buf->name << LF;
+  bench_start ("resume");
   got_focus= true;
   SERVER (menu_main ("(horizontal (link texmacs-menu))"));
   SERVER (menu_icons (0, "(horizontal (link texmacs-main-icons))"));
@@ -145,6 +146,7 @@ edit_interface_rep::resume () {
   // after a bugfix by Massimiliano during summer 2016
   eval ("(delayed (:idle 1) (refresh-window))");
 #endif
+  bench_end ("resume");
 }
 
 void
@@ -810,6 +812,7 @@ edit_interface_rep::change_time () {
 
 void
 edit_interface_rep::update_menus () {
+  bench_start ("update_menus");
   SERVER (menu_main ("(horizontal (link texmacs-menu))"));
   SERVER (menu_icons (0, "(horizontal (link texmacs-main-icons))"));
   SERVER (menu_icons (1, "(horizontal (link texmacs-mode-icons))"));
@@ -840,6 +843,7 @@ edit_interface_rep::update_menus () {
   cache_memorize ();
   last_update= last_change;
   save_user_preferences ();
+  bench_end ("update_menus");
 }
 
 int
diff --git a/src/System/Boot/init_texmacs.cpp b/src/System/Boot/init_texmacs.cpp
index 767792d689..aef1d38e10 100644
--- a/src/System/Boot/init_texmacs.cpp
+++ b/src/System/Boot/init_texmacs.cpp
@@ -18,6 +18,7 @@
 #include "merge_sort.hpp"
 #include "moebius/tree_label.hpp"
 #include "new_buffer.hpp"
+#include "new_style.hpp"
 #include "new_window.hpp"
 #include "preferences.hpp"
 #include "server.hpp"
@@ -969,6 +970,7 @@ TeXmacs_main (int argc, char** argv) {
 #endif
 
     if (N (extra_init_cmd) > 0) exec_delayed (scheme_cmd (extra_init_cmd));
+    ensure_hidden_package_set ();
     gui_start_loop ();
 
     if (DEBUG_STD) debug_boot << "Stopping server...\n";