The distribution build of WhiteCap (the file in the "into Plugins" folder) is designed to run decently on a 233Mhz iMac. If your mac is much slower or faster than an iMac, consider using a WhiteCap build in one these folders. The higher-CPU builds chop up 'samples' more than builds labeled with a slower CPU. For example, the "52 Bins (PPC G3 400+ MHz)" build chops up each sound sample into 52 pieces (or "bins") for processing while the "18 Bins (PPC60X 120-180 MHz)" build only chops up samples into 18 pieces for processing. WhiteCap's frame rate becomes:
k1 * <time it takes to copy RAM image to screen> + k2 * num_bins * <num of samples the config for that frame>
where k1 is proportional to your graphical hardware speed and k2 is proportional to your CPU speed. So there's three ways to increase frame rate: (a) buy a faster computer, (b) decrease num_bins so that your CPU will have to process less total bins per frame, or (c) choose a config that has a fewer number of samples per frame (ie, the Durn parameter is low).
The best thing to do is try each of the four builds and see for yourself how much you are willing to sacrifice frame rate in return for frame quality. Note that the folder "36 Bins (PPC G3 233-400 MHz)" is empty because that build is the build in the "into Plugins" folder.