Hi Umberto,
Thanks for your reply. About your question:
What other addons are you using?
Well, on that moment I was using Aerosoft Airbus X, Flightbeam KDEN, GSX and SODE was also running too, but I have not addons with SODE support (not yet); because it was installed together with GSX as far as I know.
I tested few days ago with a default airport and AS A319, and lagging occured constantly with every vehicle, I had to pause many times to stop lag for short periods of time, restart Couatl engine or close P3D and restart flight from scratch. I even tested with PMDG's NGX and 777, and lagging did not happen (for now).
Thanks for your help. Best regards,
Carlos D. González