diff --git a/index.js b/index.js
index 4af9c3f..9978549 100644
--- a/index.js
+++ b/index.js
@@ -92,9 +92,7 @@ export default function runAll(nodes) {
           `sent via ${hostnames[i]} - ${id}`,
           contentTopic
         );
-        // Wait 1 ms to be sure that no two messages have the same timestamp.
-        // Timestamp are in milliseconds in js-waku.
-        return delay(1).then(() => waku.relay.send(msg));
+        return waku.relay.send(msg);
       });
 
       await Promise.all(relayPromises);
@@ -170,9 +168,7 @@ export default function runAll(nodes) {
           `sent via ${hostnames[i]} - ${id}`,
           contentTopic
         );
-        // Wait 1 ms to be sure that no two messages have the same timestamp.
-        // Timestamp are in milliseconds in js-waku.
-        return delay(1).then(() => waku.lightPush.push(msg));
+        return waku.lightPush.push(msg);
       });
 
       await Promise.all(relayPromises);
@@ -230,9 +226,7 @@ export default function runAll(nodes) {
           `sent via ${nodes[i]} - ${id}`,
           contentTopic
         );
-        // Wait 1 ms to be sure that no two messages have the same timestamp.
-        // Timestamp are in milliseconds in js-waku.
-        return delay(1).then(() => waku.lightPush.push(msg));
+        return waku.lightPush.push(msg);
       });
 
       await Promise.all(pushPromises);