Consider rooting your device, and move most of your internal apps to SD.. The more less space your phone has, the more lag it gets. Also, install cache mate or app cache.. These will clear up all of your caches thus making your phone a bit faster. Another app I like is "fast reboot," basically with just one click of a button the app frees up the phone memory and making your phone a bit faster.. Another way to free up spaces is to go to setting managing application and look at all of your application. Most application will save data and cache, and I recommend to clear your data if you don't really need it anymore. That's some I can think of..
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