Hi Beeky.

If the game is running slowly it might be that your Mac doesn't meet the minimum requirements, which are: Mac OS X 10.3.9 or later
Intel or 500 MHz PowerPC G4.
32 MB of VRAM
256 MB of RAM (768 MB for iBook or G4 iMac)

All the mods in the VF Mods forum work on Windows or Mac machines, although I suggest you buy the game from the LDW site as some suppliers repackage the game and don't allow access to the images folder.