diff --git a/.gitignore b/.gitignore
index 963497a8069016c583ed50ca29d6fa29fff6e14a..e4f575b0e2c06ebae36afa7f99fe4af78f00e7bd 100644
--- a/.gitignore
+++ b/.gitignore
@@ -17,4 +17,6 @@ interface_sdk-js
 **/command-line-tools
 **/libs
 **/*.abc
+cachegrind.out.*
+perf.data*
 
diff --git a/arkoala-arkts/arkui/src/Application.ts b/arkoala-arkts/arkui/src/Application.ts
index 6fcf283dc84673edea3a68f46310acc56e5606e2..2328fe318b4f7e850e98235630b864c03dc26ba0 100644
--- a/arkoala-arkts/arkui/src/Application.ts
+++ b/arkoala-arkts/arkui/src/Application.ts
@@ -20,7 +20,7 @@ import { PeerNode } from "./generated/PeerNode"
 import { ArkUINativeModule } from "#components"
 import { EventEmulator } from "./generated/ArkEventEmulatorMaterialized"
 import { UserView, UserViewBuilder } from "./UserView"
-import { ClickEvent, SourceTool, SourceType } from "./generated"
+import { ClickEvent, ClickEventInternal } from "./generated/ArkClickEventMaterialized"
 import { checkEvents, setCustomEventsChecker } from "./generated/Events"
 import { checkArkoalaCallbacks } from "./generated/peers/CallbacksChecker"
 import { setUIDetachedRootCreator } from "./generated/peers/CallbackTransformer"
@@ -135,10 +135,15 @@ function dumpTree(node: IncrementalNode, indent: int32 = 0) {
     }
 }
 
-let crashDumped = false
-function drawCurrentCrash(crash: Object) {
+function errorInfo(crash: Object): string {
     let msg = crash.toString() + "\n"
     if (Object.hasOwn(crash, "stack")) msg += (crash as Error).stack
+    return msg
+}
+
+let crashDumped = false
+function drawCurrentCrash(crash: Object) {
+    let msg = errorInfo(crash)
     if (!crashDumped) {
         InteropNativeModule._NativeLog(msg)
         crashDumped = true
@@ -316,7 +321,7 @@ export class Application {
                     }
                 }
             } catch (error) {
-                InteropNativeModule._NativeLog("emitEvent error: " + error)
+                InteropNativeModule._NativeLog("emitEvent error: " + errorInfo(error as Object))
             }
         }
     }
@@ -333,16 +338,9 @@ export class Application {
 }
 
 function makeClickEvent(x: number, y: number): ClickEvent {
-    return {
-        displayX: 0,
-        displayY: 0,
-        windowX: 0,
-        windowY: 0,
-        screenX: 0,
-        screenY: 0,
-        x: x,
-        y: y,
-        preventDefault: () => {}
-    }
+    let result = new ClickEventInternal()
+    result.x = x
+    result.y = y
+    return result
 }
 
diff --git a/arkoala-arkts/package.json b/arkoala-arkts/package.json
index f48d5cab2a8427902a93b203017162126d2ff5c1..cdc4e2c9588c80ca09577ebca74cd1bf3c1e9f05 100644
--- a/arkoala-arkts/package.json
+++ b/arkoala-arkts/package.json
@@ -84,6 +84,7 @@
         "shopping:har-arm64": "npm run har-arm64 --prefix shopping",
         "clean": "rimraf build",
         "clean:native": "npm run clean --prefix ../arkoala/framework",
-        "clean:all": "npm run clean && npm run clean:common && npm run clean:incremental && npm run clean:interop && npm run clean:arkui-common && npm run clean:arkui-no-common && npm run clean:native && npm run clean --prefix har && npm run clean --prefix user && npm run clean:shopping"
+        "clean:all": "npm run clean && npm run clean:common && npm run clean:incremental && npm run clean:interop && npm run clean:arkui-common && npm run clean:arkui-no-common && npm run clean:native && npm run clean --prefix har && npm run clean --prefix user && npm run clean:shopping",
+        "perf:trivial": "npm run build:user && ACE_LIBRARY_PATH=build PANDA_HOME=../incremental/tools/panda/node_modules/@panda/sdk valgrind --tool=cachegrind --valgrind-stacksize=8000000 --main-stacksize=100000000 node build/index.js panda:TrivialApp 2>/dev/null && ls -lh cachegrind.out.* && echo 'Use cg_annotate to inspect'"
     }
 }
diff --git a/arkoala-arkts/user/src/ets/page1.ets b/arkoala-arkts/user/src/ets/page1.ets
index 66d1dab29aaaf2678e26ac3e58dd255a873739b5..4df805660035c89f7314d20ead39a53e648ee5d8 100644
--- a/arkoala-arkts/user/src/ets/page1.ets
+++ b/arkoala-arkts/user/src/ets/page1.ets
@@ -60,13 +60,24 @@ struct TestStructBuilder {
     }
 }
 
+function makeArray(items: number): Array<string> {
+    const result = new Array<string>(items)
+    for (let i = 0; i < items; i++) result[i] = `elem${i}`
+    return result
+}
+
 @Component
 struct Page1 {
     @State color1: string = '#ff0000'
     @State color2: string = '#00ff00'
     @State state: number = 1
 
+    data: Array<string> = makeArray(10)
+
     build() {
+        console.log(`In Page1`)
+
+        ForEach(this.data, (item: string, index: number) => {
         Column() {
             Button("Hi")
                 .backgroundColor(this.color1)
@@ -91,6 +102,7 @@ struct Page1 {
         .width('100%').height('100%')
         .backgroundColor(Color.Gray)
         .justifyContent(FlexAlign.Center)
+        }, (item:string, index: number) => item)
     }
 
     swap(): void {