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IC617 layout slow in VNC

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We recently updated from IC616 to IC617 (IC6.1.6-64b.500.14) and have felt like the interactive performance of virtuoso layout-L, even in read-only mode, has suffered.  We exclusively access the eda machines with VNC (tiger VNC).  In fact we do not have physical access to any machines that directly run the tools.  I've observed that Xvnc CPU usage (in top) will jump to 100% quite easily when trying to zoom/pan a large layout.  We've not changed anything else that I'm aware of in terms of OS, hardware, network, software other than the IC616 to IC617 switch.  Anyone have good trouble shooting ideas on how to get to the bottom of the issue and hopefully get the speed back?

Thanks

-Dan


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