I'm on the same train, on Win 7/8/8.1, I get 60+ FPS's, and on 10 i get like 30-40ish and a lot of stutters.
I already updated my drivers twice and still nothing.
I'm wondering if maybe it has something to do with the version of Source 1 that Dota 2 is using. Dota 2 Reborn is using Source 2 and I don't experience the low fps and constant stuttering as I would on original Dota 2.
As for Source games go, original Dota 2 is the only Source game where I have this issue. Team Fortress 2, Garry's Mod and Left 4 Dead 2 all work amazingly well.
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