Win 10 VM with GPU passthrough very laggy desktop

Hi, I have an old system running PVE for about 5 years now, with 5 containers and one Win10 VM. All have worked flawlessly. But recently I wanted to test GPU pass through and managed to get Windows to detect it as the primary graphics card. But its incredibly slow now EG click the start menu and takes 10 seconds to draw the menu. Let alone navigating windows. This is prior to using any apps. I know my RAM is probably too small, but seemed to work fine without the GPU.

Could someone...

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