diff --git a/.github/workflows/e2e-test.yml b/.github/workflows/e2e-test.yml
index 9fb9c040..c52f022f 100644
--- a/.github/workflows/e2e-test.yml
+++ b/.github/workflows/e2e-test.yml
@@ -57,8 +57,8 @@ jobs:
             zig-out/bin/lightpanda
           retention-days: 1
 
-  puppeteer:
-    name: puppeteer
+  puppeteer-perf:
+    name: puppeteer-perf
     needs: zig-build-release
 
     env:
@@ -105,3 +105,35 @@ jobs:
           echo "puppeteer avg duration: $PUPPETEER_AVG_DURATION"
           test "$PUPPETEER_AVG_DURATION" -le "$MAX_AVG_DURATION"
 
+  demo-scripts:
+    name: demo-scripts
+    needs: zig-build-release
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          repository: 'lightpanda-io/demo'
+          fetch-depth: 0
+
+      - run: npm install
+
+      - name: download artifact
+        uses: actions/download-artifact@v4
+        with:
+          name: lightpanda-build-release
+
+      - run: chmod a+x ./lightpanda
+
+      - name: run puppeteer links
+        run: |
+          ./lightpanda serve & echo $! > LPD.pid
+          node puppeteer/links.js || exit 1
+          kill `cat LPD.pid`
+
+      - name: run puppeteer dump
+        run: |
+          ./lightpanda serve & echo $! > LPD.pid
+          node puppeteer/dump.js || exit 1
+          kill `cat LPD.pid`
diff --git a/src/browser/browser.zig b/src/browser/browser.zig
index 7b875657..ffedfb29 100644
--- a/src/browser/browser.zig
+++ b/src/browser/browser.zig
@@ -121,6 +121,7 @@ pub const Session = struct {
     loader: Loader,
 
     env: Env,
+    loop: *Loop,
     inspector: jsruntime.Inspector,
 
     window: Window,
@@ -143,6 +144,7 @@ pub const Session = struct {
             .storageShed = storage.Shed.init(allocator),
             .arena = std.heap.ArenaAllocator.init(allocator),
             .window = Window.create(null, .{ .agent = user_agent }),
+            .loop = loop,
         };
 
         const arena = self.arena.allocator();
@@ -278,6 +280,9 @@ pub const Page = struct {
 
     // reset js env and mem arena.
     pub fn end(self: *Page) void {
+        // Reset all existing callbacks.
+        self.session.loop.reset();
+
         self.session.env.stop();
         // TODO unload document: https://html.spec.whatwg.org/#unloading-documents
 
diff --git a/vendor/zig-js-runtime b/vendor/zig-js-runtime
index 944c5f0a..c7f980e5 160000
--- a/vendor/zig-js-runtime
+++ b/vendor/zig-js-runtime
@@ -1 +1 @@
-Subproject commit 944c5f0a260a04aee284a0013d459e29c8151c2e
+Subproject commit c7f980e5946cb0211a1827d9c0041a0820193f9f