I forget the most important....
Are you using an "onboard sound card" ????
Onboard sound cards are "FPS Eaters".
I was having lot of troubles with SH3, very low FPS in the "bottle necks".
I was not sure, then i buyed an X-FI, i didnt buyed the most expensive because i wasnt sure if it will solve the problem...
Bad decision... game runs wondeful after replace my onboard sound card by an X-FI.
I was having about
7 FPS in the bottle necks, after X-Fi install they never runs under
35/40 FPS in the bottle necks.
I am so sorry i didnt buyed the most expensive, wich has own incorporated, built in memory.
There was a version of X-FI with 64mb built in memory incorporated.
I buyed the no memory one...
Another trick.... do not use 4.1 or similar settings into your sound card control panel, SH3 and SH4 runs better in 2.1, if you use 4.1, you will lose many sounds, and FPS.
Try disabling any strange sound effects, just run it on 2.1 with 3D positional audio enabled only.

