@Trojans
The Xperia T2 it's 2 years old, apps and games are getting heavier and more hardware demanding, unfortunately there isn't much that you can do, other than:
uninstall unused apps
clear the app cache/data from streaming services (pandora, spotify, youtube) and social media (instagram, facebook, twitter) and also chrome.
transfer media to an SD card (photos, music, videos)
