On longer play sessions, I've noticed my PC begin to slow down exponentially. When I close the game, my PC becomes incredibly laggy, and the lag issues don't clear up for a while (probably the OS garbage collector taking time to kick in). I believe the culprit may be a memory leak, as session duration has a large impact on how bad the lag is and how long it lasts.
#Potential memory leak
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Here's my Player.log, although nothing jumps out at me (I suspect you'd need to run it under a profiler to find any memory leaks)
Unity has a built-in Memory Profiler that could be useful for finding this kind of bug
What missions were you playing?
It happens with all missions, but this time it was the LM campaign, specifically the mission where you dock with and extract the LM from the S-IVB