I used Toad and improved 256 frames in 1-2!
http://dehacked.2y.net/microstorage.php/info/40327110/0050%20-%20Super%20Mario%20Advance%20%28UE%29.vbm
And I made a comparison to compare with Peach, Toad and Luigi.
http://www.mediafire.com/watch/2152qqa7d7edrj5/SMA_4screen_comparison.mp4
got4n found a new trick in 1-2, but only Luigi can use this trick more quickly. You can see the bottom screen of Luigi's test.
In the top screen of Luigi, I fail to touch the 256 frames rule line, only 20 frames slowly. And it slower than the new trick run.
So I can say Toad is the best character for 1-1 and 1-2.
I used U version to test, and found U version has the less lag than J version in title screen.
Comparing with the YoungJ1997lol's wip, it's seemed VBA-rr-24m has the less lag than 23 version for this game. When I tasing the peach run, I didn't eat the more fruit in 1-3 and 4-2. Because when the starman appears, it made some lag. Though starman is useless for peach, maybe it's useful for mario, and I will change emulator, too.