I am running a beige G3 233MHz with 225MB of memory. Programs run at a very acceptable speed. OmniWeb is plenty fast. Faster than any browser I have used under OS9. The only slowness that bothers me is program launching which is slow, very slow.
Classic environment is absolutely glacial in starting up.
I would rather that Apple put the effort into adding the missing bits. I am particularly annoyed that they didn't support printing via the serial port. The printing with serial ports problem is just a question of adding serial printing support to the driver. It's a UNIX system. When I first installed OS X over 9.1 over 9.04 on an unpartitioned and likely fragmented drive, my results were less than stellar.