Thanks a lot for your help. ^^
My project is a pretty little game. I thought it can run on low-end device without problems. I was wrong. ^^
Do you know if Contruct is calculating every tick for every element of the scene or only for those visible on the screen?
At my office, I work with Unity and it calculates only for elements visible by the camera. I don't know if Construct does the same.
Is there a camera system on Construct? Do I make one for my game?