slow down when using scaling

[LunaMoo]

Try different scalling, listing them:
- xBRZ is the lightest one while looking exactly same as hybrid(which is xBRZ+reverse AA ~ not really usefull imo and it is much heavier),
- bicubic is just slightly better than no upscalling at all possibly not worth doing it,
- and hybrid+bicubic mixes those two making it the heaviest one with half of the effect of previous ones, so it's usually better to use lower xBRZ scalling than hybrid+bicubic for similar result.

Or upgrade, as I just noticed you're using outdated 0.9.8. Latest ppsspp limits how much is upscalled per frame to avoid such slowdowns. Textures might get upscalled later resulting in an effect similar to one from unreal engine which in some games is not noticeable at all(since the texture which is set to upscale later might not even show later if it's just part of menu transition animation), but it's certainly better than lags;p.