Default ZTE Blade G - Help

Hey all. I didn't find any section in this forum about the phone ZTE Blade G. But I was wondering, I bought this phone for my mom and it's slow as h*ll even tho it has a dualc. proc. and 512MB ram. The phone even from the start was all laggy and now since I have installed some apps in it, it even got worst. It feels exactly like my old ZTE Blade which had about 0,6GHz proc.

So does anyone know how to fix the lag on this phone. Maybe install another rom if there is any? Or root and boost the proc? Or any other way?