output the original reslution can get more speed?

[Carter07]

It will increase performance if you are gpu limited, xperia play (adreno 205) and galaxy nexus (sgx540) now thanks to the jit saving a lot of cpu cycles are gpu limited so they would benefict a lot using native psp resolution, in some games like lumines you get about double performance (15 fps vs 30 fps with xperia play) .