I think CPU usage seems to be markedly higher full stop with SU12.
My usual test is to park the Fenix A320 at stand 519 at iniBuilds LHR and let it settle down. I use either FSLTL prioritising the JustFlight models or FsTraffic itself so no live traffic. Prior to SU12, with the clear weather preset (actually, it makes no difference if Live Weather is on or not) the FPS with a cold and dark aircraft would be well in to the 40’s, ordinarily about 45.
Since SU12 it’s 30-33. Something has unquestionably changed for the worse and I’ve also, for the first time ever experienced stutters and actual pauses when flying. This is EXACTLY what I experienced during the beta and I left because of it. When I did a clean install of SU11 the performance was much much better.
DX12, 4K Ultra with DLSS Quality
5800x3D
RTX 3090
32GB 3200mhz DDR4
Fast NvMe SSD
Edited to add - on this system DX12 has always been better on account of the VRAM on the 3090. It would appear that with SU12 DX11 is now better which isn’t right at all!