I'm not a fan of Tapatalk. Bleh. I use Dolphin as my browser so websites work like they do on my computer. No need for Tapatalk.

Best thing I could have ever done for my Android phone was once it was off warranty was that I rooted it. That way I could delete all the T-Mobile bloatware they installed on it. Now I have all kinds of memory space. I can also run a defragmenter and a few other things I couldn't use before.

By the way, most Android apps have memory leaks so they'll start chewing up RAM on you for no reason. Restarting your phone occasionally, deleting old text messages and maybe getting something like Memory Booster Lite will help its performance.