A Nintendo rep told Game Informer:
|“As previously announced, New Nintendo 3DS has an improved CPU, which enables Super NES games to run on the system with quality results. The Super NES games also include Perfect-Pixel mode, which allows players to see their games in their original TV resolution and aspect resolution.”|
Basically, the old 3DS cpu can’t quite handle it well enough.
If you intend on trolling the comments with lies like on Nintendo Everything, don’t bother trying.