FPS Drop in Unreal Engine 5.6 when using any additional windows like content browser, project settings, material ediging, even notifications

any time I’m using Unreal Engine 5.6 I have a serious trouble which is very frustrating.

when using any additional windows like content browser, project settings, material ediging, even notifications, I don’t see the reason why this could be happening as I’m running on a AMD Ryzen 9950x3d, 128 gb of RAM and a RTX 5090. I have updated drivers and everything, please don’t give me the typical advise like: “update your drivers” or “change from cinematic to low” because I’ve tested it all.

No matter how simple the level is, even on fresh new projects I’m having 120+ FPS on the editor but as soon as I open the content browser, edit a mesh, edit a material or even on UE notifications I get significant FPS drops as crazy as from 120 to 15-20 FPS and I sincerely can’t work this way.

Anybody facing the same problem?