I think you should have 128MB or at least 64MB. 32MB is not enough IMO.
You probably have gfx board that can do true color graphics eating lot of RAM. Decoding buffers for AmiNetRadio can easily eat few megs. PPC binaries are approximately twice as large and you need som (probably lot) RAM for JIT too.
32MB could work if you have fast HD for swapping! :-)