It's not just one scene, it is multiple, actually. I can give you a few examples:
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I don't know how to answer the other 2 questions, as I said, I'm pretty new to this. I do
think it has timeline, it did install as a dependency, but I'm not 100% sure.
It depends, actually, on the settings. If I go into user preferences and set the physics refresh rate to 45hz, the FPS drops, but the desync is less than on auto (which sets it at 90hz IIRC), but it is still very noticeable. If, however, I set it to 244hz, the FPS increases, but the animation basically goes into bullet-time.
It helps sometimes, but is far from completely solving it. However, that may very well be because I am not configuring it right and choosing the wrong audio source.
I'm running 1.22.0.3. AFAIK, that seems to be the latest.
I haven't checked this specifically(I had hoped 24 bloody gigs of VRAM and 32 gigs of RAM would be enough for any non-production workload, lol), but I
have run the optimizer a few times. Although, that was on a previous installation where I had everything and the kitchen sink installed as mods, and I had read that that can be a reason for slowdowns, so I reinstalled everything from scratch, going for a lighter build. I don't remember exactly if I have run it this time, I'll try to monitor and see if these suggestions work when I find some time, TYVM.