If your file ends in .cso , it is heavily compressed. Converting it back to .iso can fix performance issues without increasing the file size significantly. Download a free tool like or PSP ISO Compressor . Set the action to Decompress CSO to ISO .
Thanks to community compression, you don't have to miss out on the greatest hits. Here are some legendary titles frequently found in highly compressed formats: highly compressed psp games under 200mb fix
(Highly optimized, smooth combat)
Use Level 9 for the highest compression (smallest file size) or Level 1–5 for better performance. Convert: Click convert to create your .CSO file. If your file ends in