This makes me think you did not use a pre configured setup file for the rover.
Too many messages from F9P can flood AGIO and make AOG slow. Only GGA and VTG is needed. (latest Panda do not even need VTG)
There are setup files for F9P firmware 1.12 , 1.13 and 1.3
Start reading here: Improved konfiguration files for f9p with firmware 1.13 - #126 by clogenson