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Are you using 5.1.x? It had a ton of performance improvements over 5.0.x and earlier.

I regularly run 30-40 VMs at once on my dev server at work (40 cpus, 384gb ram), and I haven't had any problems like this there or at home...

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Amazing, we are using 5.0.x I'll see if that helps. Thank you!

Another random thing I just remembered: if you're doing work in the VMs that is heavy on network I/O, try turning GRO off. We saw a big performance increase by doing this: https://github.com/contiv/volplugin/blob/master/Vagrantfile#...

One other thing: VirtualBox 5.1 is only supported by Vagrant 1.8.5 and newer, but 1.8.5 has a 100% showstopper bug where the SSH key inserted into the VM is not chmod'd correctly and OpenSSH refuses to look at it. Use 1.8.6 or newer instead.

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