Anti lag system how to

Hi can anyone tell me the list of reasons why the game is lagging?
except for having a triggered events.

A gif or video of your game would be much appreciate, but anyway check all your events and look close maybe some of you events are executing always when really needs to be trigger one time, thats the beginning, later check the camera follow, the size of your assets, and in Preferences->Resources go and click on the remove unused files