Oh, being more specific, i meant heavy as in "cpu intensive" which are those typical games that can not run at full speed without frame drops or frame skips.@niuus I don't know if you refer by "heavy" to games that take a large amount of space or heavy as in technically complex.
I booted up Mother 3, which has a size of 32MB (the biggest size on GBA I think) and it seems to work well, frame rate is stable, I started a new file and played for around 25 minutes, in and outside of battles everything seemed fine.
Ninja Five-O, Donkey Kong: King of Swing, the Castlevania games, Astro Boy: Omega Factor, Konami Krazy Racers (this one had issues in the past, but now seems to work well!), the Mario Advance games (Even Yoshi's Island works full speed, at least what I tried!) and a few others I've tested and worked great. Rayman Advance was another one with issues, but in the quick check I did earlier it seemed to work fine too (although I'd recommend play other version of it, personally).
Now, the video options seem to have changed with the jump to 0.7, and I have to find a setup that I like, but I really have only good things to say about mGBA on Wii. Not everything is perfect, and issues pop up here and there as the github page shows, but not only is an emulator constantly being developed, it's not even a 1.0 release still and it works like a charm.
The GB side works than before too, sound has been improved and it's quite nicer!
Judging by Dodain47 comment and your report, it's pretty much safe to say that this is an almost perfect release, which is great!
GB should work like a charm! I'm eager to play on the CRT again, and test this new version