Lag in mobile game

How can remove lag.

Because I use external events. All of the conditions and actions for all levels is in one external event. So my problem is even I don’t use the object1 in my scene, because of external event it still checking the condition for object1. For example it check if the player is collide with the object1. I think because of that my game lag.

This Helps

How to debug poor game performance [GDevelop wiki].

You can and should add a condition to check a global variable if you are in the scene for which the event is. So your collision checks, etc. are ignored for all other scenes.