If your not getting any GPS info at all the Rx/sensor may not be functioning. Try a different cable/lead first. Do you have any other sensors installed on the X-Bus? Have you tried the GPS sensor by itself on the Bus and in both the 1&2 ports?
Your STi dongle does have a good solid orange LED.Right?
I see you said you mounted it out with Rx and all. The sensor/GPS Rx itself needs to be away from everything else.
As for lagging. I havent used a pad much and I dont own one. On other devices it is a huge advantage to make sure you keep your recently used apps list deleted. Especially ones like Pandora. Despite what others have told me I found that many do continue to run in the background and/or stay partially resident and eat up memory and/or processor resources. Im not positive but I assume the same is true for pads. Ive run mine on iPhone 5 with the lightning adapter and it works fine. On any of my devices if I forget to clear the recents the STi app does get laggy and slow. Maybe this applies to your problem.
Last edited by Aerocal; 01-13-2015 at 08:01 PM.