For low-end devices, drop internal resolution to 2x and disable MSAA, but keep frame skip at 0 at all costs.
To achieve extra quality gameplay, follow these optimization tips: guitar hero 3 ppsspp extra quality
Note: Some versions may require you to manually edit the .ini file to add the 60 FPS code. This varies by region (USA vs. Europe), so ensure you have the correct code for your game version. For low-end devices, drop internal resolution to 2x
Backend: Use Vulkan for newer Android devices or OpenGL for older hardware. For low-end devices
This guide will walk you through achieving the definitive experience.