Recently I've acquired my Sony Xperia SP, and since then I've tried many roms available online. Until now, I'm not convinced with every one of them. Let me to tell my story step by step:
01. First I flashed my phone's kernel from .254 to .266 using Flashtool, and then I rooted it. Aparently, I did wrong the process and it bricked. Then again I flashed it again from stock rom and did it once again the rooting process successfully. Afterwards, I installed CWM Recovery.
02. The first rom I tried was PurEXPerience sirius 3.5.0 that I read it was based on Android 4.3 and I felt my phone well, but unfortunately failed the data mobile connection (I'm paying a 4G Mobile Service) and I tried and tried but I was unable to navegate using data mobile. Even inputting an access point manually; I didn't get the 4G network back.
03. Currently I'm using a flashed 4.3 Stock rom with root properties and triple recovery installed. Using Phil'z recovery mode, I did the basic wipes (Factory Reset, Cache, Dalvik), installed rom and SU update, and finally I flashed the baseband using Flashtool. The permomance now it's been quite strange. The 4G connectivity is back, but I felt the phone's perfomance too slow and it freezes time to time, specially using the Clean Master app. Even uninstalling some useless system apps, and I don't feel ay change at all.
I'm afraid that my phone won't be able to be as fast as I felt it using its original stock rom. Is there any suggestions about a rom available online, which could be fast, best performance and that I could get 4G connectivity without problems?
Thank you so much for your time.
P.S. Sorry for my bad english.