Everyday I fly around my local airport a few times. I have a “circuit” about 15 miles square around the airport. Day before yesterday I was getting about 28fps, yesterday 66fps, and today 36. Everything is the same, same circuit, same altitude, same plane, same weather, same everything (on purpose).
The only thing I can think of that might cause this is the MS servers.
My question is what else could account for this?
Pretty much default setup, a couple of BlackSquare planes.
Weather most importantly clouds. Was you flying with live weather or using the same weather for each flight? And yes it could be server side as well. also are you using the default weather engine or a 3rd party weather engine like the one from REX?
Which airport? If it’s a busy one you could be getting different levels of AI traffic, and each plane has a cost.
Have you tried flying multiple flights in offline mode, not connected to MS severs? Also, there are dozens, maybe hundreds of dynamic “things” between MSFS on your computer and the MS servers including the Windows OS. Any of these can impact performance.