Default [Q] How to change the OS of a cheap no name tablet?

I have a cheap no name tablet with the following configuration:
1. Cortex A8 1.20GHz single core
2. 512MB DDR3 ram
3. 4GB memory
4. Android 4.2.2
5. 7"

Is there a way to change the OS with a faster smoother one? It doesn't matter if it's older than the current one, i just want to be faster and smoother because with the current one (4.2.2) the tablet simply lags horrible, it's unusable. Also it doesn't matter if it's official or custom, i need something to make this crap work faster or i'll throw it on the window.