For no visible reason FPS drops significantly to 15-20 midgame, r_stats shows high GPU waiting (flapping from 30 to 150 ms). I thought it was something with GPU overheating and throttling but it's not that, temp is less than 60°C (for my 560 GTX it's quite cool). Fortunately switching to Fullscreen Windowed and then back to Windowed immediately fixes that and I have 35-60 FPS again. Fullscreen Windowed has noticeable worse performance for me, 10-15 FPS less than just Windowed. I'm playing on almost everything maxed up except atmospherics, AA and AO. Here's log.txt: http://pastebin.com/W0p9q2sp
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