jumpy framerates in zelda SS

[darkconsoles]

Hi,
i have a problem in Zelda Skyward Sword, whenever i play it all feels, looks and plays great and smooth
but everytime after like 20 minutes game starting to look jumpy, like it skipping frame or something like that, its hard to explain, like "smooth, hick, smooooth,hick" every damn second
interesting thing is that framerate counter is unaffected and still shows good fps's
it all gone after restart and again after 20 minutes

my pc:
phenom x6 1100t 3.8
gtx 570
8gb ram

dolphin version is a 7719

[Zee530]

Check your temps!

[Starscream]

Old revisions like r7719 are unsupported, use something newer.

[darkconsoles]

i tried a few new revisions, still get this hiccups