There are glitches used in WR like 4-1 with the mushroom block hit turning mario backwards on the flagpole, 4-2 wrong warp, and 8-4 wrong warp.
BBG on the American version softlocks the game while the japanese version does work but BBG does this: and doesn't save any time :(
For FPG it isn't worth it since you can get the "best framerule" by pressing A at the right time on the title in 1-1 and in 4-1 you would need to do perfect pipe jumps to keep the sub-pixels right. Also there are just easier time saves than doing FPG SeemsGood
15623 when 400 appears starting 8-4 [frames starting at power on] or 15195 when 400 appears starting 8-4 [frames starting in 1-1 400 appearing]
Didn't see a save for FCEUX so here it is: https://bit.ly/2HcyoTz
I would use Hubcapp's lua script instead -> https://bit.ly/2GAUH4k Open Fceux Click File/ lua/ New Lua Script Window.../ browse and click the file downloaded then press run in the Lua Script Window