I have done a comparison between the iPhone 4s and the Samsung galaxy s4...4s is speeder and fluider than my s4....i couldn't believe this! The only solution is to flash a custom rom or there are other ways?
That's not terribly unbelievable. To speed up the S4 you can disable bloat as well turn off Window animations (in Developers options). You can also disable the home button's activation of S-Voice. Doing these things will give your S4 a bit more pep.