MAME on an A1200

[fishy_fiz]

I used to use mame a lot on amithlon/os3.9 and pretty much all games it supported worked nicely,... not really relevant to your question, but it was fun
As for your question, a gfx card will help somewhat, but if you dont have one I recommend trying an earlier version as typically mame gets slower as the revision numbers grow (Im assuming 060 is the revision number rather than an architecture spcific compile ? I might be wrong, but I know there is mame v0.60 for 68k amigas (latest version available for 680x0 I beleive)). I must admit though Im surprised Galaga doesnt run well on an '060.
Anyway, there's quite a few versions of 680x0 Amiga mame, cant hurt to try some others
 http://caesar.logiqx.com/php/emulators.php?id=amiga is a good place to start (although there are other versions too).

[fishy_fiz]

Unfortunately there's no real options for gfx cards for an 680x0 a1200 in its original caseing. With a blizzardppc you can use a bvision, but for 680x0 based amigas you'll need to use something like a mediator (pci busboard), which means removing it from its casing and towering it. About all you can do is try lowering color depth and/or resolution of your Workbench, trying fblit (probably wont help a lot, but might a little) and tweaking mame usage (lowering sound bitrate/disabling sound/etc.). As for which version is the best for your setup I cant really remember, but I think maybe Amame is a good place to start (its on aminet I believe).