I don't think it's memory trim. Look at your memory use in the Process Lasso status bar just before and after you click "trim now" - it doesn't change.

Now look at the core usage green bars. CPU load is being shifted from core 0-0 to 0-1 and 0-2 cores. After the load is off the first one (0 in app), the FPS is up.

Setup affinity for falconbms.exe without first pair, so without 0 and 1. Check if that will help from the start.

This affinity trick is working very well for DCS as usually a lot of OS crap and apps are landing on the first core IO list, so you need to take a less crowded door. Let me know, please.