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Whole PC is stuttering/laggy/choppy... how to fix?

Joined
Feb 15, 2009
Messages
642 (0.12/day)
Location
Norway, which means Amazon is not available...
System Name Winter v3.2024
Processor Intel i7 12700K (since november 2021)
Motherboard Gigabyte Z690 Gaming X (since november 2021)
Cooling Air Liquid Freezer II 360 with LGA1700 kit (since november 2021)
Memory Crucial Ballistix 2x16gb 3600mhz C16 (since november 2021)
Video Card(s) Gigabyte RTX 3060 Ti Gaming OC Pro LHR - Rev3.0 (since july 2022)
Storage 1x 1TB WD Blue SN570 SSD, 1x Seagate 4TB SATA
Display(s) 1x 55" LG C1 4k OLED, 1x Gigabyte 32" M32Q and 2x AOC 27" CG1
Case Fractal Design Define R6 (since 2018 and still working like a charm!)
Power Supply Corsair RM850x black (since august 2022)
Mouse Razor Deathadder v2 (since december 2021)
Keyboard Varmilo VEA109 v2 MX Silent Red (since august 2022)
Software Windows 11 Pro
Ok, so at first i thought it only happened when watching youtube videos, but everything else is also being rather stuttering/choppy... How do i fix this? I just added a 1440p screen to my pc... it's my only 1440p screen, so can that be the reason for it, or? Here's a video how it looks like:

any ideas on how i can fix this?
 
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