Windows 10 (CPU?) Problems

Dec 31, 2018
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My Win 10 Laptop (which is like 2 days old) is just a total mess.
Sometimes the CPU is stressed out to
100% from minor tasks and sometimes it will just drop to
0.79-0.8 Ghz after running on 100%.
If I run ANYTHING its like super slow
(Games run fine for like 3 minutes but then the FPS are dropping, Youtube takes ages to load)
I have no clue whats the problem.
I checked temperature and I don't think that it is the problem (39° C on Idle and 58 ° C when in a Game).

Thanks in ahead
 

1. List laptop specs
2. Run disk defragment and see if this works.
 
If the device is that new, I would take it back and have it exchanged for a different correctly functioning device. New devices should not give you problems.
 
disk defragment won't work and CPU usage is just totally broken ... sometimes on 100% for no reason but when in a game/programm it is barly more than 70% but runs slow anyway. Probably will return it