We have a customised submap and when it is updated using the OVW API it
looks like 
the entire contents of the screen are deleted and then redrawn. When the
computer is under high load you see a grey background slowly being
populated by symbols. This can take several seconds. 

Similarly when the Event Window is receiving lots of events it appears
as if the window is flashing. 

What kind of window update mechanism is used by Netview? For example, is
it using the X11 double buffering extension protocol?

Are there any ways to tune the performance somehow?

Note we are still using Netview 5.1.0 so has anything been done to
improve the window update mechanisms in later versions of Netview?

Thanks
-- 
Robin
email: robin.james AT thalesatm DOT com