If anyone knows of a 68030 emulator (maybe Basilisk?) that can boot Linux, then I might be able to use that for faster testing.
I've played around with NetBSD on FS-UAE. I'd use it more, except for the fact that the emulation of the Commodore 2065 ethernet card gives very flakey networking.
The emulation was configured with an m68030 & m68882, and I've heard it can run Linux, too.
This difference alone could probably double or triple the performance even without the clock speed change.
Even though the external cache can do burst transfers to the CPU's cache, this definitely wouldn't double or triple performance - most of the time the CPU isn't waiting for data from memory. It'd be faster, but not significantly.
John