Standard PSP game dumps are ISO files. High compression converts these to CSO (Compressed ISO).
Your fireteam must infiltrate hostile territory, interrogate the rogue agent, and neutralize the threat before it triggers a global catastrophe. Gaming & Technical Notes Portability:
SOCOM: Fireteam Bravo 3 - PlayStation Portable Standard Edition socom fireteam bravo 3 psp highly compressed
offers the highest compression but may cause slower loading times or occasional "stuttering" during gameplay.
Retro Tactical Gaming Hub Reading Time: 6 minutes Standard PSP game dumps are ISO files
Regarding the highly compressed version, I couldn't find specific information on a version with that exact description. However, it's possible that you may be referring to a custom ROM or a modified ISO file that has been compressed to reduce its file size.
There was a golden era when the PSP was the undisputed king of tactical shooters on the go. Leading that charge was the SOCOM: Fireteam Bravo series. While Fireteam Bravo 1 & 2 set the standard, was the swan song for Zipper Interactive’s iconic handheld run. Gaming & Technical Notes Portability: SOCOM: Fireteam Bravo
The game also features a cameo from , a series veteran who has left the Navy and now leads a private military company called Talon International. SOCOM: US Navy Seals Fireteam Bravo 3 Review