UPDATE: Ok, so only the debug mode seems to get hit by the FPS drop. I know that the debug mode needs more resources but it still ran with 60FPS this morning. But anyway, I can live with a fluent game in normal mode and a laggy debugger.
this morning my game ran without a prob at 60 FPS, I saved and closed the file. Now I wanted to continue working on it but noticed that the FPS dropped to 40-50 without me changing anything. I tried to restart my laptop, cleared my browser cache and cookies, tried to run it in node-webkit. No improvement what so ever. My game is very CPU light, since it is going to be for mobiles. As I said, I didnt have this problem this morning and constantly tested my game before.
Only plugin I use is for Spriter and Construct 2 version 170
Intel I7-4700MQ 2.40GHZ
Nvidia Geforce GTX 770M, Intel HD Graphics 4600
performance picture: dropbox.com/s/hp3vvvxaye3izbs/performance.jpg
Does anyone have any idea? I mean something must have changed!