add cpu warning

css/app.js

@@ -332,9 +332,19 @@ loopOption.addEventListener("click", function() {
 });
 
 speedOption.addEventListener("click", function() {
-
     var currentSpeed = video.playbackRate;
     var newSpeed = getNextSpeed(currentSpeed);
+
+    if (navigator.hardwareConcurrency < 3) {
+        var userChoice = confirm(
+            "Your system has less than 3 CPU cores ;_; Increasing the video speed will CPU usage and affect performance - Do u want to continue?"
+        );
+        
+        if (!userChoice) {
+            return; 
+        }
+    }
+
     video.playbackRate = newSpeed;
     document.getElementById("aud").playbackRate = newSpeed;
     speedOption.innerHTML = "<i class='fa-light fa-gauge'></i> Speed: " + newSpeed.toFixed(2) + "x";