Users searching for "NSP updates" are often looking for a patch (an update file usually denoted as UP or DLC in the scene) that might fix these performance issues.
When Nintendo eShop users first downloaded Arkham City as part of the trilogy, they encountered a rocky launch. Frame rates dipped into the low 20s during gliding sequences, and texture pop-in was aggressive. Enter (and later 1.0.3). batman arkham city switch nsp update exclusive
I'm assuming you might be referring to a complete translation or localization file for the game, often distributed as a "paper" or a text file. Users searching for "NSP updates" are often looking