Hello,
edit: on a hunch I tried uninstalling an reinstalling FSUIPC7 (but without any of the "extras" selected) and now I can't reproduce the issue. ignore what's below
I recently for the first time needed to install FSUIPC7 for a new piece of software (A Pilot's Life 2), and have noticed that there's a bit of a performance impact.
Importantly, even with A Pilot's Life closed (and nothing else I own uses FSUIPC7), I get what I'm calling "microstutters" about once every second. Very small, rhythmic hiccups in the frame rate that might not be noticed by many players. If I attempt to pan the view rapidly with the mouse I also get some more frank stuttering. If I go into the FSUIPC7 app and click MSFS->disconnect, the microstutters disappear and so does the stuttering with panning; reconnect and the microstutters come back.
Anyhow, I posted this over on the MSFS forums and most of the users there claim there is zero performance hit from FSUIPC7, so I thought I'd bring this up in case it's not yet on your radar here; might be an issue with the new beta. At least one other person in that thread sees what I'm seeing.
FWIW, my specs: i7-9700k, 3080, Win 11, 64GB RAM, MSFS (SU12 beta) on a custom graphics setting somewhere between high and ultra.