Question Stuttering/Freezes on new build

[DamiKnight]

Ok guys, so I just upgraded my CPU

The build:
Ryzen 5 3600
MSI B-450M Pro-VDH
Corsair Vengeance LPX 8GB x2
GTX 1050 2GB

My problem is that the PC stutters, like I cant watch videos on Youtube without them freezing for 3-5seconds, games dont run at full potential.

Funny story: GTAV runs at as low as 10fps, but as soon as i open task manager, it goes to full 90fps which should be the performance of this build

CAN ANYONE HELP? THISHAS BEEN FRUSTRATING FOR ME

 

[DamiKnight]

maybe i should try changing the PSU

it didnt help