Doesn't feel that much quicker though..

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What are you using for video output? The motherboard (built-in) video output is IMO the worst bottleneck in the system, at least as far as user experience goes. It uses system RAM for video, which is waaaay slower than VRAM. The best choice is an HPV card.

How much cache does your G3 card have?

When I use my AV card the system freezes when It starts to load the crescendo extension, but It works when I turn extensions of on start up.

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You may have to force either the Crescendo extension or the AV extension/s to load first, by adding a • to the front of their filenames. If that doesn't work, I would suggest using Conflict Catcher or Symbionts to trim down your extensions & CPs to a minimal working set and then re-add what you want slowly, testing each time.