Originally Posted by TheReduxPL

But when I was using Advanced Task Killer in my previous Android Version (2.3.3; before rooting) I was experiencing a very big performance jump. I've only done these things I've added in my first post. Also I want to maximally increase my phone's battery life.
Which ROM should I use to increase performance and battery life? Cyanogenmod?

ilwt or elitemod have been the best i have found for battery life so far

Or glite gslim

Thanks for recommendations, but do Cyanogenmod have other features than that mentioned in cyanogenmod.com?

Originally Posted by TheReduxPL

Thanks for recommendations, but do Cyanogenmod have other features than that mentioned in cyanogenmod.com?

Yes, there are heaps and heaps of interface, performance and other awesome things in it. I'd highly recommend it, i've been using CM 7.2 for about a week now and it's absolutely fantastic. I'd highly recommend it.

It's not just the features that are listed on their site, it's the speed and stability of it that makes it GREAT to use. Battery life is great too.