1-Clean up your home screen
Some good wallpapers app Zedge,Premium Wallpapers HD,Backgrounds HD Wallpapers 40M+
2-Uninstall and disable unused apps
Tap on any app you don’t want and then choose Uninstall or, if the option is not there to uninstall, tap Disable. Disabled apps will be listed in a new tab, so you can always enable them again in future if you change your mind.
You should also take a look in Settings > Apps at the Running tab. Some apps want to be running all the time and they can seriously impact on performance. Think carefully about whether you need what’s listed there.
3-Try a third-party launcher
4-Overclock your Ace II
Install a custom ROMRooting your Android device doesn’t automatically offer any performance improvements, but a custom ROM can. For some devices that are no longer being updated custom ROMs are a way of getting a newer version of Android. You can also find custom ROMs that dispense with bloatware entirely and offer some interesting tweaks and modifications. You’ll need to do some research to find the right custom ROM for you.