: The VitaGrafix plugin can be used to adjust internal resolution or unlock frame rate caps on supported titles, though Pirate Warriors 2 is already noted for being quite smooth on native hardware.
: Ensure no other applications are open and the Vita is not in "Power Save Mode" for Wi-Fi, which can throttle speeds. Enhancing Gameplay Performance
Pirate Warriors 2 generally runs better than its predecessor, maintaining a more stable frame rate during both single and multiplayer. However, "better" performance can be achieved through modding:
1 or 2? - One Piece: Pirate Warriors 2 - GameFAQs - GameSpot