Default [Q] Galaxy Nexus - Slow Read, But Fine Write Speed

Ok,
First it started on 4.3, it was very slow, but then i tried lagfix fstrim it did a little difference, but it didn't fix storage performance speeds, i certainly gave up hope and kept using lagfix to get rid of lags.
But then i flashed KitKat 4.4 (CM) Mpokang Kernel,did a little recycling on memory, and filled it again to 2 - 2.5 gb free space.
After a andro bench test i get awesome write speeds but poor read speeds. same applies even if i fill the whole storage to 1gb or 500mb left.
I want to do a complete factory reset, and format whole storage maybe then it will get fixed.
So anyone had a similar problem ?