There has been some big changes in the emulator industry. The PS Vita Emulator has finally been completely developed and can be downloaded at https://psvep.com/.
The emulator can currently run PS Vita games aswell as PlayStation 3 games. The PlayStation 4 games will be coming soon but are still in development.
FPS has been boosted to 60, instead of the low 30FPS of the regular PS Vita console.