Windows 10: CPU usage drops from ~100% to ~30%

When I start to play GTA V, my FPS is great and graphics are fine.But after a few minutes of playing the FPS suddenly drops drastically, and the game has a lot of issues with rendering the area. At the same time, I saw on my task manager that the CPU-usage dropped from around 100% to about 30%, while on MSI Afterburner it stayed at about 100%. The clockspeed also went from 2.4GHz to 0.8GHz.Could anyone please assist me to resolve this issue?

:)

 

CPU Usage Stuck at 30%

I'm sorry but there are no background process using 30% of cpu. The highest one is Microsoft Software Protection Platform, using 7% of cpu. The other one is Explorer, using 3% of cpu.

Should i disable it?

That is 10%. So there is another 20% being used somewhere and it must show in details tab using more details on bottom to show all processes. It has been this way from day one of Windows OS's. Or maybe there is malware or a virus. But it still should show
CPU usage and items combined will equal the total CPU usage.

 

cpu usage at 100%

CPU usage at 100% from start up for no apparently good reason. Service Host appears to be the problem but I cant narrow it down more than that at present.

Any suggestions?

I am using Windows 10 full release version 64 bit.

 

CPU Usage Stuck at 30%

I'm sorry but there are no background process using 30% of cpu. The highest one is Microsoft Software Protection Platform, using 7% of cpu. The other one is Explorer, using 3% of cpu.

Should i disable it?