4k monitor frame drop in fullscreen

Hello !

problem : https://youtu.be/SLoUFk0w2-M

no mods enabled
frame skip on or off
seems to run fine in windowed but frame drops in fullscreen.

Multiplayer: no
Tried with hdr off and on

Windows 11
ryzen 7 7800x3d
radeon 7900 xtx
32gb ram