mobile

Hello. So yesterday i wanted to restore my phone to stock, when I realised that I had deleted my backup folder by a mistake. Today I flashed a baltic (SEB) rom for i9301i that I got from sammobile. Now I believe my phone works slower than before. It only shows that I have 1.35GB ram when it showed 1.5GB before, but I might be wrong, because before kmy phone worked perfectly fine. I need your help. Could someone tell me a good firmware to flash? I don't really know what firmware I was running before. Oh, and when my phone rebooted, after the flash, it didnt boot for the first time, so I had to reset it via recovery.