Legacy Softwares, latency issues in classic mode Options

[jeanclaudevanlee]

I have PB 1.5 running OS X 10.3.9 and I'm a happy Logic 7 user... but still my favourites tools come from previouse era.
I cannot boot into OS 9 and unfortunatelly have to use Classic...

...and here come the problems. Midi works great using Midibridge application but audio has too large latency. I downloaded latest Prosoniq driver but it's still about 1 s. Definitely to large to make anything.

Does anyone know how to make performance better a bit? Can I optimize classic for that somehow? Is there any better with Tiger, adding more ram?

thanks for any help,
P.