When you see links for an "Extra Quality Highly Compressed" ISO for WWE 2013 on PSP, you are typically encountering one of two things:

The official was developed by Yuke's and published by THQ for PlayStation 3, Xbox 360, and Wii . It focused heavily on the Attitude Era and introduced the "Predator Technology" engine, which was too demanding for the aging PSP hardware.

To achieve a "Highly Compressed" feel without losing performance, enable Frame Skipping (if on older hardware) and set the Rendering Resolution to 2x or 3x PSP for HD graphics.