AutoDiscovery Slow?

I’m still using 2015 R2.4 and the AutoDiscovery class. I’m seeing exceptionally laggy communications for even really short messages. I thought perhaps that using a Poll periodically would help but that doesn’t appear to have made any difference.

I’m testing on Mac OS X (EC) and running a Linux VM and a Windows 7 VM for the different environments. Some messages will come right away and some can take as many as 20 seconds. That just doesn’t seem right.

Anyone have any sage words of advice?