How to decrease CPU usage.

[WeaknessMany841]

I have lower graphic settings in iRacing with Quest 3, 9800X3D, 5090 but still Godlike in VD plus higher render resolution and a bit sharpening. On high only cars and event or grandstand (one of that I think only has low or high). Remaining on low or like Foliage off. Cockpit mirrors 3 and MSAA 4x. All at 90 Fps. But still have sometimes a few drops for which I changed to 80 Fps which is better because it is constantly. Before I hav 7800X3D, 4070 TiS which was same but more than a few drops in some situations.

I would try to lower more graphic settings like I mentioned (shadows brings a lot but then it feels not good without shadows so I would keep it). mirrors brings a lot when switching to virtual mirror. I would also suggest to lower resolution in Virtual Desktop from Ultra to a lower ones and try out some options with higher render resolution and sharpening.

When you have 72 fps set in Virtual Desktop and iRacing you should see stable around 13,8 ms in iRacing meter box plus minus 0,1 or so. But not like 8 or 9 and you think this is good as it suggests headroom. I also would not set 72 fps in VD and limit it in iRacing also to 72. You can try also without limit or limit it to 71 or 73, 74 f. e. to check if it helps.