Current state of Snapdragon-based CPUs in PPSSPP

[Nyco30]

Hello everyone. This is my first day and message on this forum.
I DLed PPSSPP yesterday (0.9.8) on my brand new 1+1 (Snapdragon 801 / 3Gb RAM), thinking that hell yeah, let's kick some asses with this beast on PSP games. I did not put any build ATM.
Well, the result is quite disappointing, lagging way too much even if I tweak the settings.
Sorry, I'm pure noob when it comes to this. Anyone can tell me what build I should use and how to install it on the device? I DLed this one ppsspp-v0.9.8-1633-g06f058d-android but I'm not sure it is the right one, neither where to put it.

Thanks a million for your help,and kudos to the admins!!!

[EDIT] already read noob guides. Improved the speed indeed, but really not enough. FFVII Crisis Core still at 15-20 FPS with all suggestions made...Can't believe it cannot do more than that.
Tried also to put the last build to work (launch it through my device) but states that another version already exist with another signature...What should I do?