You probably don't have any control over this but, could you make the xperia perform better?
Sent from my HTC Desire C using xda app-developers app
You could try this: (Not Sure if it helps though)
Open Loopysmoothness script from /system/etc/init.d using root explorer app and change
USER_LAUNCHER=to the name of the launcher you are using (check the name in /data/data folder) and the execute the loopy smoothness script using root explorer.
Also try freezing some apps like facebook or google maps if you dont use them ( these apps tend to always remain in the backgroung so consumes some ram)
But in the end performance is dependent on the hardware and not much we can do about that.