After never having ACC run without stuttering, and returning after buying the GT4 pack I was determined to try and resolve the issue. I was running at 80 to 120 fps in 4k but was still plagued with the dreaded microstutters.
Most of you may already know this, but for those who it may help.
To resolve the issue (for me anyway) if you locate the file ac2-win64-shipping.exe (which in located in your ACC game folder SteamLibrary\steamapps\common\Assetto Corsa Competizione\AC2\Binaries\Win64) - right click on it, select properties, select the compatibility tab and click on Disable Full Screen Optimisations. In game set the frame limiter to your screen refresh rate and turn on V-Sync. Windows Game Bar Mode also needs to be disabled for this to work.
I also used the same same option on the acc.exe file (which in located in your ACC game folder SteamLibrary\steamapps\common\Assetto Corsa Competizione\AC2) just in case.
It's cured my microstutters and I've been able to put most settings back to epic on 4k and retain solid 60fps with no stutters
Kudos and my eternal thanks to PhilS13 at the AC Forums who posted this solution over a year ago, just wish I'd found it sooner.
Most of you may already know this, but for those who it may help.
To resolve the issue (for me anyway) if you locate the file ac2-win64-shipping.exe (which in located in your ACC game folder SteamLibrary\steamapps\common\Assetto Corsa Competizione\AC2\Binaries\Win64) - right click on it, select properties, select the compatibility tab and click on Disable Full Screen Optimisations. In game set the frame limiter to your screen refresh rate and turn on V-Sync. Windows Game Bar Mode also needs to be disabled for this to work.
I also used the same same option on the acc.exe file (which in located in your ACC game folder SteamLibrary\steamapps\common\Assetto Corsa Competizione\AC2) just in case.
It's cured my microstutters and I've been able to put most settings back to epic on 4k and retain solid 60fps with no stutters
Kudos and my eternal thanks to PhilS13 at the AC Forums who posted this solution over a year ago, just wish I'd found it sooner.