diff --git a/Cargo.toml b/Cargo.toml
index 2d63fbda9..fd6b1f347 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,3 +6,7 @@ members = [
     "example_glium",
     "example_wasm",
 ]
+
+[profile.release]
+lto = true # very slightly smaller wasm
+opt-level = 's' # 10-20% smaller wasm
diff --git a/docs/example_wasm.js b/docs/example_wasm.js
index 92c115f76..b4553d0ba 100644
--- a/docs/example_wasm.js
+++ b/docs/example_wasm.js
@@ -492,6 +492,10 @@ async function init(input) {
             handleError(e)
         }
     };
+    imports.wbg.__wbg_newnoargs_ebdc90c3d1e4e55d = function(arg0, arg1) {
+        var ret = new Function(getStringFromWasm0(arg0, arg1));
+        return addHeapObject(ret);
+    };
     imports.wbg.__wbg_call_804d3ad7e8acd4d5 = function(arg0, arg1) {
         try {
             var ret = getObject(arg0).call(getObject(arg1));
@@ -500,14 +504,6 @@ async function init(input) {
             handleError(e)
         }
     };
-    imports.wbg.__wbindgen_object_clone_ref = function(arg0) {
-        var ret = getObject(arg0);
-        return addHeapObject(ret);
-    };
-    imports.wbg.__wbg_newnoargs_ebdc90c3d1e4e55d = function(arg0, arg1) {
-        var ret = new Function(getStringFromWasm0(arg0, arg1));
-        return addHeapObject(ret);
-    };
     imports.wbg.__wbg_globalThis_48a5e9494e623f26 = function() {
         try {
             var ret = globalThis.globalThis;
@@ -580,6 +576,10 @@ async function init(input) {
         var ret = getObject(arg0).subarray(arg1 >>> 0, arg2 >>> 0);
         return addHeapObject(ret);
     };
+    imports.wbg.__wbindgen_object_clone_ref = function(arg0) {
+        var ret = getObject(arg0);
+        return addHeapObject(ret);
+    };
     imports.wbg.__wbg_instanceof_Memory_7ccbf540b50fc2bf = function(arg0) {
         var ret = getObject(arg0) instanceof WebAssembly.Memory;
         return ret;
diff --git a/docs/example_wasm_bg.wasm b/docs/example_wasm_bg.wasm
index 0bd847a6c..e5b07a175 100644
Binary files a/docs/example_wasm_bg.wasm and b/docs/example_wasm_bg.wasm differ
diff --git a/emigui/src/containers/menu.rs b/emigui/src/containers/menu.rs
index c036ea099..c0e416f56 100644
--- a/emigui/src/containers/menu.rs
+++ b/emigui/src/containers/menu.rs
@@ -44,6 +44,14 @@ pub fn bar<R>(ui: &mut Ui, add_contents: impl FnOnce(&mut Ui) -> R) -> (R, Inter
 
 /// Construct a top level menu in a menu bar. This would be e.g. "File", "Edit" etc.
 pub fn menu(ui: &mut Ui, title: impl Into<String>, add_contents: impl FnOnce(&mut Ui)) {
+    menu_impl(ui, title, Box::new(add_contents))
+}
+
+fn menu_impl<'c>(
+    ui: &mut Ui,
+    title: impl Into<String>,
+    add_contents: Box<dyn FnOnce(&mut Ui) + 'c>,
+) {
     let title = title.into();
     let bar_id = ui.id();
     let menu_id = Id::new(&title);
diff --git a/emigui/src/containers/window.rs b/emigui/src/containers/window.rs
index 191269ac2..5b1f25919 100644
--- a/emigui/src/containers/window.rs
+++ b/emigui/src/containers/window.rs
@@ -126,6 +126,14 @@ impl<'open> Window<'open> {
         self,
         ctx: &Arc<Context>,
         add_contents: impl FnOnce(&mut Ui),
+    ) -> Option<InteractInfo> {
+        self.show_impl(ctx, Box::new(add_contents))
+    }
+
+    fn show_impl<'c>(
+        self,
+        ctx: &Arc<Context>,
+        add_contents: Box<dyn FnOnce(&mut Ui) + 'c>,
     ) -> Option<InteractInfo> {
         let Window {
             title_label,