Originally Posted by Cymru
OS 4.1 is quite fast and a great pleasure to use running on both versions of the A4000D/T.
I have used OS 4.1, and I wouldnt dare recommend it to anyone, in a Classic Amiga at all.
It takes about a minute to boot, and eats something like 64MB of fastmem just to make it usable.
On a SAM, speedwise, works well, but then that is a better PPC architecture, than a 199x accelerator, which is a kind of a mutant low performance PPC beast.
I see OS 4.x as a nice experiment/proof of concept or even a geek toy for PPC accelerators on 68k, but not really efficient enough for every day use.
If you have a Commodore-Amiga it is best stick to an AmigaOS 3.x customized distribution. You will get an overall much better experience.