Depends on the addon. Yesterday I reinstalled AI Ship traffic again… when you fly overseas, and a ship is on the horizon, at a certain point I loose 2-4 frames (24 to 20). Same with the Seasons addon and many trees on low altitude. When an addin is active everywhere, or the addon is your aircraft , it can always affect performance. Any other addon, e.g. scenery, will not involve FpS cost, unless you are near the place. Some addons have bad scenery, that causes textures to be handled wrong, or texture decompression to be executed too often. In that case, you’ll notice when you fly over. It’s not only third party addons. The official airport of Atlanta (KATL) written by Asobo had (or has) issues with FpS. I haven’t tested that recently, maybe they solved it with the WU-patches…
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