Broken Sword low FPS rate

[MendMySword]

Hello there, hope someone can, ahem, mend my broken sword. No pun or innuendo intended.

I played Broken sword on the official build of Dolphin. I got about 8 FPS. I enabled Dual Core, put the frameskip up to 2, and fiddled with the graphic settings. That got me up to about 9 FPS.

I downloaded an unofficial build from here:
http://unknownforce.selfip.com/

I have no idea what is different, but this gives me about 15 fps. Kudos to the person who built it. It would be great if anyone has any ideas about how to improve that a little more.

Specs:
32-bit windows XP
1.5 Gb RAM
ATI radeon Sapphire HD 3650 (AGP)
Pentium 4 CPU

[MendMySword]

Sorry I should have said before that this was Wii Director's cut version of Broken Sword.

[nosound97]

Your PC is not powerful enough to play this game at full speed

[MendMySword]

Ok, which part? Can I solve this by getting more memory or do I need a new CPU?

[thuyquai]

Pen 4 is bad , buy a core2 at least