The keyword "download better" implies that simply getting the file isn't enough. You must curate the environment around it. Upgrade your storage, unlock the Vita’s true clock speed, and apply the community mods. Once you do, you won't believe this game ever ran poorly.
Many claim to offer “direct download” or “NoNPDRM” files, but they often include malware, broken links, or require outdated firmware. Stick to official PSN or your own game backup if you own a physical cart.
Performance and Stability On the Vita, OPPW2 was a native port optimized for the handheld. Performance is constrained by the Vita’s hardware compared with PS3/PS4/PC versions, but the download vs. physical cartridge does not materially affect in-game frame rates or graphical fidelity. Both digital and physical PS Vita versions run identically because the game code and assets are the same; differences come only from firmware, memory card speed, and installed updates. Thus, performance is a neutral point in choosing download over physical media.
1 or 2? - One Piece: Pirate Warriors 2 - GameFAQs - GameSpot
Then, inside the game’s options menu:
One Piece Pirate Warriors 2 - Sony PS Vita Japan Game - eBay UK