Need help picking a MAME version for your machine? Here are two resources to help guide your choice of version for your "performance" needs.
* Aaron Giles benchmarks MAME (0.37b15 to 0.113) running pacman:
http://aarongiles.com/?m=200704* MAME Benchmarks user-contributed data:
http://benchmark.mameworld.info/Based on Aaron's research (using one machine running one game with one trial), it seems any of these are the "last versions" before a speed penalty. Balance this against your hardware and compatibility needs, and see what happens. It's likely your results will be different.
0.37b16
0.60
0.62
0.92u20000.106
<latest>
I leave the discussion of "DOS vs Linux vs TinyXP vs ..." as an exercise to the reader.