diff --git a/incremental/compat/src/arkts/observable.ts b/incremental/compat/src/arkts/observable.ts
index 43ad4ae28ed6443ab01aa88a0f8b33bf0601bfca..1abea6ae320b614f987ea05360d10afd6889ba2f 100644
--- a/incremental/compat/src/arkts/observable.ts
+++ b/incremental/compat/src/arkts/observable.ts
@@ -181,7 +181,7 @@ export function observableProxyArray<Value>(...value: Value[]): Array<Value> {
     return observableProxy(Array.of<Value>(...value))
 }
 
-const PROXY_DISABLED = true // because of ArkTS Reflection performance
+const PROXY_DISABLED = false // because of ArkTS Reflection performance
 
 /** @internal */
 export function observableProxy<Value>(value: Value, parent?: ObservableHandler, observed?: boolean, strict: boolean = true): Value {
diff --git a/incremental/demo-playground/src/main.ts b/incremental/demo-playground/src/main.ts
index a4ff32a38b5a9b4dda49e577ff9f33c2661dd2ec..b5c185124d18af99553a0243352f14619010d483 100644
--- a/incremental/demo-playground/src/main.ts
+++ b/incremental/demo-playground/src/main.ts
@@ -13,7 +13,7 @@
  * limitations under the License.
  */
 
-import { uint32 } from "@koalaui/common"
+import { observableProxyArray, uint32 } from "@koalaui/common"
 import { CONTEXT_ROOT_SCOPE, IncrementalNode, NodeAttach, ReadonlyTreeNode,
     contextLocalValue, memoRoot, mutableState, updateStateManager,
 } from "@koalaui/runtime"
@@ -72,4 +72,21 @@ state.value = 19
 
 updateStateManager() // Compute the next frame.
 console.log(root.value.toHierarchy())
-console.log("-----END-----")
\ No newline at end of file
+console.log("-----END-----")
+
+function performance(count: number, proxy: boolean) {
+    const s = mutableState<Array<number>>(
+        proxy
+            ? observableProxyArray<number>()
+            : new Array<number>()
+    )
+    const t1 = Date.now()
+    for (let i = 0; i < count; i++) {
+        s.value.push(count)
+        s.value.pop()
+    }
+    const t2 = Date.now()
+    console.log("count:", count, "  proxy:", proxy, "  time:", t2 - t1)
+}
+performance(1000000, false)
+performance(1000, true)