PPSSPP is highly optimized for mobile phones.
Blur is currently in a state of limbo. Because Activision lost the car licenses (Ford, BMW, etc.), they cannot legally sell the game anymore. This makes it "Abandonware." Blur Psp Iso Download
If you have an old PSP, you must install Custom Firmware (CFW) to play backed-up ISO files from the memory stick. PPSSPP is highly optimized for mobile phones
While you cannot play the PSP version (because it doesn't exist), you can play the original Blur on a portable Sony device: the PlayStation Vita. This makes it "Abandonware
Because the PlayStation Vita has a different architecture than the PSP, it is capable of playing select PlayStation 3 games via Cloud Streaming.
The most stable way to play PSP games on a computer is using PPSSPP (PlayStation Portable Simulator Suitable for Playing Portably).
Why it works: Blur had a heavy emphasis on "Momentum" and crashing. Burnout Legends is the king of crash physics on PSP.