The Vita version can struggle with frame rates in busy areas. Many users recommend using a plugin like PSVshell or LOLIcon to overclock your Vita to 500Mhz for a much smoother experience.
The USA physical version didn't include Japanese voices on the cart, but if you're using NoNpDrm, ensure you grab the "Voice DLC" packs if you want to switch audio languages. World of Final Fantasy PS VITA (USA) (NoNpDrm)
Connect your Vita to your PC via USB or FTP using VitaShell. The Vita version can struggle with frame rates in busy areas
If you have the PS4 version, this game supports Cross-Save , allowing you to pick up your progress on the go. but if you're using NoNpDrm