For the best performance, use the Vulkan backend and set the rendering resolution to 2x or 3x PSP if your device allows. Official Alternatives for Handheld Play
Realistic advice: For the true Storm 2 experience on mobile, consider streaming via PS Remote Play or Xbox Cloud. However, for those seeking the PSP mod scene, the performance is surprisingly solid. Naruto Shippuden Ultimate Ninja Storm 2 Iso File Ppsspp
: Mods often replace original textures and menus with those from Ultimate Ninja Storm 2 Storm Connections For the best performance, use the Vulkan backend