Hey there @Pavvlito! Welcome to the community! With your rig you shouldn’t be having too many issues with the editor. For reference, my secondary rig is about half as powerful as yours and runs the editor quite effectively, so there’s definitely something wrong.
If you’re using Geforce GameReady Drivers, try to swap over to the Studio drivers. I’ve gained much more stability in UE4/5 editor side when I made the change.
Are you using UE5.1 exclusively? If so are you also using SM6 (Shader model 6)? It may have prompted you to enable it when you started the editor. If so, there is one known issue that hasn’t been pinned down causing pretty significant spikes on very specific installs/hardware.
Worst case you could attempt to drop down to DX11 RHI but you’ll lose access to anything that needs DX12 to operate.