Iblitz, you have a dual core cpu? If so, read on!
GREAT NEWS FROM NORWAY! Anyway, the zync thing in the cfg and/or forcing vzync did nothing for me, still stuttering all over the place. The thing that DID work however, was forcing SH4 to run on 1 cpu. Ctrl+alt+delete, rightclick on the sh4.exe (while game is running), set affinity, uncheck cpu 1 (or 0, your choice, hehe)
Now the game runs like a charm at steady 40 to 60fps with everything maxed out.
*sigh of relief* Now I can sit down and actually play this game, since the real show-stopper is gone.
Kinda sad that one has to do this in 2007, but hey.
PS: WOW! The forums are badly bogged down by all the SH4 captains.