From experimenting, I can confirm that it is not just people flying with custom paint jobs but also 3rd party aircraft. Especially the free aircraft. My friend loaded in with the carbon cub from flightsim.to and my frame rate went to 2fps. When he quit my frame rate went back to 50fps. He loaded in with a default aircraft and there were no issues. There appears to be a serious problem with how flightsim is handling 3rd party addons. Micro stutters are always present on multilayer in general. Rolling back my driver to 466.11 (if I remember well) also helped improve performance.
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