If you're looking for a highly compressed version of the game, I couldn't find specific details on file size or compression ratio. However, I can suggest some general guidelines:
Smaller files mean less time waiting and less bandwidth consumed. socom fireteam bravo 3 psp highly compressed
If you have the full ISO file, you can compress it yourself into a format using tools like PSP ISO Compressor or UMDGen . If you're looking for a highly compressed version