Unity lag when play but not when build

Hello, i got a problem, i dont know why, when i play in editor, i got 15 FPS and when i build & run i got 70 FPS.
i got a 3.0 GhZ, 8Gb Ram, I5 PC and a good graphic card.
Thanks for help

It’s expected that running in the editor will be slower than running a built game. However I can’t tell why you are experiencing such dramatic slowdowns in the editor. If you have Unity Pro or Unity Trial, try using the Profiler to figure out what is going wrong.

Perhaps you have some editor scripts that are a bit unoptimized, to name one possible cause. It’s impossible to tell with no knowledge of your project.

Profiler screenshot