>>The bottleneck
 >>I guess is A4000's old IDE controller and also AGA set is not implemented 
in
 >>X11R6.
 >
 >It is probably more the significantly slower CPU unless you have
 >an old 486 running at 25MHz.

The A4000 also has /very/ slow memory access in comparison with an 
accelerated A1200 or an A3000.

Regards...

Jim