diff --git a/app/api/cron/push-scheduler/route.ts b/app/api/cron/push-scheduler/route.ts
index 181134e..233846f 100644
--- a/app/api/cron/push-scheduler/route.ts
+++ b/app/api/cron/push-scheduler/route.ts
@@ -32,7 +32,7 @@ export async function GET(req: Request) {
       const isPushReady = initWebPush();
 
       if (isPushReady) {
-        for (const push of scheduledPushes) {
+        await Promise.all(scheduledPushes.map(async (push: { id: string; topic: string; title: string; message: string; image_url: string }) => {
           // Pobierz odbiorców dla danego tematu
           let query = supabase.from('push_subscriptions').select('subscription_data');
           if (push.topic !== 'wszystkie') {
@@ -55,12 +55,15 @@ export async function GET(req: Request) {
               webpush.sendNotification(s.subscription_data, payload).catch(() => null)
             ));
           }
+        }));
 
-          // Zmień status na wysłane
+        // Zmień status na wysłane
+        const pushIds = scheduledPushes.map((p: { id: string }) => p.id);
+        if (pushIds.length > 0) {
           await supabase
             .from('push_history')
             .update({ status: 'sent', created_at: now })
-            .eq('id', push.id);
+            .in('id', pushIds);
         }
       } else {
         console.warn('[CRON] Pominięto wysyłkę zaplanowanych powiadomień - brak konfiguracji VAPID.');
diff --git a/test_perf.js b/test_perf.js
new file mode 100644
index 0000000..d3c9878
--- /dev/null
+++ b/test_perf.js
@@ -0,0 +1,34 @@
+const performance = require('perf_hooks').performance;
+
+async function mockQuery(delayMs) {
+  return new Promise(resolve => setTimeout(resolve, delayMs));
+}
+
+async function sequential(pushes) {
+  const start = performance.now();
+  for (const push of pushes) {
+    await mockQuery(50); // mock query subs
+    await mockQuery(50); // mock update status
+  }
+  return performance.now() - start;
+}
+
+async function optimized(pushes) {
+  const start = performance.now();
+  await Promise.all(pushes.map(async (push) => {
+    await mockQuery(50); // mock query subs
+  }));
+  // mock bulk update
+  await mockQuery(50);
+  return performance.now() - start;
+}
+
+async function run() {
+  const pushes = new Array(10).fill({});
+  const seqTime = await sequential(pushes);
+  const optTime = await optimized(pushes);
+  console.log(`Sequential time: ${seqTime.toFixed(2)} ms`);
+  console.log(`Optimized time: ${optTime.toFixed(2)} ms`);
+}
+
+run();