The first thing I would do is make sure I have plenty of free memory.. If not free some up.
Turn off WiFi or moble connections
The next thing would be multiple programs open .. close all programs besides the Mobile pod.
Next try another IOS program like JamUp Pro XT.
After all that if I still had latency I would start checking wiring, last ditch resort the SonicPort itself may be faulty then i would arrange to send it to tech support to see if they could find a problem..Eliminate the easiest things first then look for the not so easy.
I run live with Sonic port straight to my home PA and our house PA,, with no latency issues at all.