The reason you may have seen a lot of mame34 submissions recently is because that was the version that had to be used for the tournament that just ended...(posted 9478 days ago)Apart from that, I found that on my computer (a Pentium MMX overclocked to 225 MHz), a lot of games run a lot smoother on mame34 than on later versions of MAME. Apparently, and unfortunately, it seems that MAME is getting worse as far as optimised for speed is concerned...
Cheers, Ben Jos.