Try the D3D plugin (if you're not already using it) or one of the projection hacks under the game properties. This speeds up a lot of games for me. Otherwise, support for the game may just not be up to snuff just yet. You might have to wait for a newer build that runs this faster.
As for the sound issues, I have no idea about them but you could try the RE0 hack in the DSP plugin and see what happens. Or try the LLE plugin, I dunno.
As for the sound issues, I have no idea about them but you could try the RE0 hack in the DSP plugin and see what happens. Or try the LLE plugin, I dunno.