To clear the cache go to
and tap on catched data to clear the cache storage.
If your phone has extra apps in it then it's better to remove those extra apps, because extra apps consumes space as well as these apps needs some RAM to run this cause slow doen your phone.
for uninstall the apps you should go to
Here’s a tip on how to make your Android device run a bit smoother: disable its animations. You will need to have access to Developer Options which can be found under Settings or About device.
Note: If you cant fine developer option then you need to go
and tap on it repeatedly until you see "You are now a developer!". Developer options are now enabled.
Use only importent widgets, Remove all unnecessary widgets from screen because widget continue use your phone process and this is the big reasion of slowing down the phone.
I know this is not a trick but this step is required after all of this steps, so please restart your phone to see the effect tacking place in your phone.