how do i optimize my 2d game? (it's taking 90% of my cpu)

Hi. You have given little information.

Pay attention to events without a trigger, all events that do not have a green arrow are executed every tick, which is about 60 times per second.

And if you add "for each" to such events, all objects will be searched every tick.

I recommend to use the for each event with a trigger, for example after a collision or at the beginning of the layout, or put it in the event every few seconds.

Also i think the debugger itself can contribute to a high cpu usage.

Also i think the debugger itself can contribute to a high CPU usage.

I actually found this to be the case in a CPU issue I had a while ago. jackpodon It can be handy to make your own CPU monitor separate from the debugger as described in the construct manual...

https://www.construct.net/en/make-games/manuals/construct-3/tips-and-guides/performance-tips

Something is looping, probably some event is causing high CPU load. Check in debugger, maybe some event is causing countless objects. Too many objects on a layer can also slow down the game.

thanks all, now its only taking 35%.