Hm, must be an intel only thing, or cpu only thing. No improvements here, on A10-6800k.
Tried disabling cores 1 and 3. No difference. Then re-enabled them and changed options.txt maxresourcethreads to 4. No difference.
33-36 FPS on top of Fort Ikon. All settings maxed except 2x anti-aliasing and 2x anisotropic.
Oh well, it was worth a shot. Glad that people are reporting improvements from this though.