After SU5 I found I had stutters all the time in spite of better frame rates. I tried an old trick of using Process Lasso to disable “Windows dynamic thread priority boost” on Flightsimulator.exe and the stutters disappeared.
Recently there have been a number of articles on gaming sites reporting that Windows has released a patch to combat poor performance caused by a combination of issues with Windows power modes and Windows game mode. It is currently an optional update. So I installed it to see it made Process Lasso redundant. And the answer is Yes, with optional update KB5004296 installed I no longer required Process Lasso to ensure smooth performance.
A couple of caveats.
- KB5004296 didn’t appear in my Windows optional updates until I installed another optional feature update for Windows.
- The first time I used MSFS after the update I have a couple of CTDs. I have only had 1 CTD since SU5 so more CTDs could be a cause for concern. I rebooted my PC and the CTDs seem to be gone. Had been at Charles de Gaulle when I had the CTD and that is notorious as MSFS killer. Tried a couple more times same location and no further problems.
You can find more details about the fix here. The Windows 10 gaming performance fix is out, here's how to get your PC up to date | PC Gamer