SME causing 1-2 minute hang before and after render. Max2015

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I have a fairly simple scene with multiple tabs in the SME with some fairly heavy material definitions. 

With SME open, when I hit render, there's a LONG delay before rendering begins and after it ends. 

With old material editor, there is no delay.

I am using 3dsmax 2015 latest SP, with latest version of VRay. 

Has anyone else suffered this issue? 

Any ideas what could be causing this? I would prefer to be able to leave my SME open between test renders. 

Thanks

Patrick

[jonathan.matthews]

Hello Patrick-

I hope this note finds you well.

In regards to the long delay in rendering with SME open...

1. Have you tried resetting 3ds Max to see if that helps improve the speed? http://knowledge.autodesk.com/support/3ds-max-design/troubleshooting/caas/sfdcarticles/sfdcarticles/...
2. Does it speed up with SME closed?
3. Have you tried not using VRAY?  Is it faster without VRAY? http://knowledge.autodesk.com/support/3ds-max/troubleshooting/caas/sfdcarticles/sfdcarticles/3ds-Max...

Looking foward to hearing back from you soon.

Best Regards,

Jonathan Matthews

Autodesk Technical Support.

p.s.

The case that was auto created in our Technical Support system will be closed as I will continue to follow up with you from the forum.  Thank you.