diff --git a/src/Plugins/Qt/qt_tm_widget.cpp b/src/Plugins/Qt/qt_tm_widget.cpp
index 3da04c8be0..58284be30e 100644
--- a/src/Plugins/Qt/qt_tm_widget.cpp
+++ b/src/Plugins/Qt/qt_tm_widget.cpp
@@ -119,13 +119,6 @@ qt_tm_widget_rep::qt_tm_widget_rep(int mask, command _quit)
   visibility[6] = (mask & 64)  == 64;  // side tools #0
   visibility[7] = (mask & 128) == 128; // bottom tools
 
-#ifdef OS_WASM
-  visibility[1] = false;   // main
-  visibility[2] = false;   // mode
-  visibility[3] = false;   // focus
-  visibility[4] = false;   // user
-#endif
-
   // general setup for main window
   
   QMainWindow* mw= mainwindow ();
diff --git a/xmake.lua b/xmake.lua
index e0d2f7f43a..0f1a3ad815 100644
--- a/xmake.lua
+++ b/xmake.lua
@@ -596,6 +596,8 @@ function add_target_draw()
     add_files("src/Mogan/Draw/draw.cpp")
 
     if is_plat("wasm") then
+        set_optimize("fastest")
+        add_ldflags("-sASYNCIFY")
         add_ldflags("-s --preload-file $(projectdir)/TeXmacs@TeXmacs", {force = true})
     end
 
@@ -694,6 +696,8 @@ function add_target_code()
     add_files("src/Mogan/Code/code.cpp")
 
     if is_plat("wasm") then
+        set_optimize("fastest")
+        add_ldflags("-sASYNCIFY")
         add_ldflags("-s --preload-file $(projectdir)/TeXmacs@TeXmacs", {force = true})
     end
 
@@ -778,6 +782,7 @@ function add_target_research_on_wasm()
     add_files(plugin_xml_srcs)
     add_files("src/Mogan/Research/research.cpp")
     
+    add_ldflags("-sASYNCIFY")
     add_ldflags("-s --preload-file $(projectdir)/TeXmacs@TeXmacs", {force = true})
     
     before_build(function (target)