Great mission, but something I noticed is it gets extremely choppy, almost unplayable, if I play for more than 15 minutes at a time. This only happens with this mission.
I have 24 GB of ram (nothing else intensive running in the background either) and a decent video card, and lowering the graphics settings doesn't seem to do anything. When I exit, and restart the game, it's back to normal, even in open areas, before it eventually degrades, so I'm pretty sure there's some kind of problem particular to this mission