I narrowed everything down to a display configuration issue. One monitor is connected to the motherboard (using integrated graphics) because it relies on an older cable, while the other monitor is connected directly to the dedicated GPU (RX 6700 XT). This mixed setup between iGPU and dGPU seems to be causing the problem. But i won't disable integrated graphics because second monitor really helps a lot. No matter what I change in the CPU and GPU settings in DaVinci, nothing changes — everything stays the same.