OS becomes laggy when exporting in 4k

Hi guys. Is it normal for my PC to become laggy when browsing the web when rendering in 4K? My only solution to fix this is to have windows pass through to on board graphics by using the display cable on the motherboard. The issue is then is I lose about 10% in performance. Any solution to would be greatly appreciated.

my specs are an i9 1400k and an nvidia 4090. Thanks