On a very old workstation with dual Intel Xeon E5-2660, 32GB Ram and a GTX1050 I had no problems to edit HD content.
Now I got a new PC: AMD Ryzen 9 5900X
Asus X570 PG Velocita
64GB Ram 3200-16 Vengeance LPX
MSI 10GB D6X RTX 3080 VENTUS 3X Plus
In both cases the system and Premiere are on a SSD and the content on a HDD.
On the new PC I can not play back the same content with no effects in full resolution. After a few seconds the playback jerks and will be set a few frames back every second. Audio is affectetd too. What could be my mistake? Renderer is set to GPU(Cuda).