Have you created a profile for your jet on the flightplan page...where you can specify climb/descent rate that usually helps to regulate your climb to desired altitude and reduce any time where you are waiting for further instructions.
Yes I did, according to our PF3 User Guide, Page 134, 20.1 Executing a Flightplan, saved in the button "Save these settings...". My Climbrate is about 2500ft/m, descend is 1900ft/m. That should be fine for a jet like an Airbus 319, roundabout...
To provide you with logs, which setting is needed in the debug level? It´s zero now, should it be 3 or more? I will try level 2 for the next flight. Hope that´s enough.