I exerience this pretty often on far cruise travels when bit by bit the screen starts to lag.
Especially the 90min Hutton run always started smooth but the longer i was flying my screen kept getting graphical lag and started to stutter.
When leaving cruise everything is normal again.
In most other systems there are no problems (eventhough i also encounted it here and there).
I couldnt believe that it is a graphical problem but tested to reduce my graphic settings from ultra to minimum. Problem remains.
Its also no normal i-net lag... coz then this problem would happen everywhere.
Anyone else having such problems?