Hello! Thank you for opening this thread, the problem with my MacBook is that sometimes after launching some apps (especially that graphics process is requiered), the machine behaves like playing a game with 10-15 fps. I open activity monitor and I see in the cpu usage that the kernel task runs too high. The only solutions is to make a reboot. After rebooting it, it runs like before.(*) The cpu proximity temperature is ~40 C and the GPU a bit lower. Also after trying to play a video e.g from the photos.app its also plays in low fps. On youtube videos it goes a bit better. I think that the GPU is responsible on a higher grade for all these problems and the CPU for a less.(**)I think that the GPU can't render. How can i test my cpu and gpu ? would be helpfull if ill replace the therman paster? Can you tell me your thoughts about fixing the problem ? *( Not too smooth, it lags in some points but I don't know the reason.) **( most times the cpu usage is high while using safari or chrome (all other apps are not running) I don't know if the os cause this or a bad config.(the OS was installed on 01/MAY/2018) MACBOOK SPECS: i7 on 2 Ghz. 16gb ram. Samsung ssd evo 250 (trim is enabled). No battery installed. OS: Sierra. NVRAM has been reseted. The machine was for photoshop,Autocad etc. Thank you for reading ! Any help would be acceptable !