If you're using the VGL Transport (vglconnect), then remote X11 is
what's happening.  The VGL Transport is not recommended over slow
connections for that reason (because the non-3D elements of the GUI have
to be sent using remote X11, which is extremely fine-grained and thus
very slow on high-latency connections-- particularly when you're talking
about a toolkit like Swing that is not particularly well optimized for
remote X11 usage.)  This is literally the reason why TurboVNC was
created.  Strongly advise using it or another X proxy when connecting
over a slow link.

DRC

On 6/21/17 8:58 PM, Michael A. Saverino wrote:
> 
> I am running a NASA WorldWind based Java application using VirtualGL. 
> The 3D GL rendering of the globe and terrain over local gigabit and
> remote VPN is excellent.  However, clicking on a Java Pull down or
> Button causes the application as well as all windows on the client to
> freeze for a period of about 10-15 seconds.  I never get the pulldown
> menu displayed.  This only manifests itself on the slower remote VPN
> connection, not the Gigabit Lan connection.  Any ideas to what may be
> happening?  The VirtualGL server is Ubuntu 14.04 with OpenJDK 8 and
> 2.5.3 of VirtualGL.
> 
> Thanks,
> 
> Mike...

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