I have a new Windows computer that is not running any game properly. I already reformatted it because the Windows it came with was full of manufacturer trash. I installed all drivers from manufacturer sites and stopped the superfech perfech thing and also changed the Windows power settings to max performance, used cache dumping programs, Ccleaner, stopped Windows Defender and Windows Update and defragmented the HDD but I'm still facing stuttering in every game.
The stuttering is like, its at 120 fps super smooth but suddenly goes to 10 then back to 120 then 10 then 120 every 30 secs, which makes everything unplayable. In games that allow forced max FPS I force it to 30, but still stutters. I have a Intel i7 8th generation, 8GB ram, Nvidia MX 150 4GB GPU and 1TB WD Blue HDD. It's fairly decent and should be running most modern games at least on low, but even super optimized games like GTA, and old games like The Sims 1 and Minecraft stutter for some reason. What should I do?
By the way, if I go to task manger, I see that the Nvidia GPU is only being 5% used, I don't even know if that has something to do or what not. It has an Intel chipset that it treats like a video card but it stays at 0% usage forever. HDD is only 100% at startup, after 2 minutes it goes to 2% or 3%.