@Oliver - I just found out that the problem ended up being a malfunctioning WiFi access point that gave the illusion of slow network performance - and yet I got the blame because during the time period the techs analyzed, the traffic to dash.poolmining.org was the ONLY network traffic, nobody looked at it in context though to see how little traffic it really was. Funny how that works.

Thanks for looking into this Oliver. I'll let you know what I ended up finding out from the engineers. They're capturing some packets tonight to try and figure out what might be causing the bandwidth problem.

This lends some credence to my suspicion that it wasn't the miners after all though.

How do I get in touch with Oliver?

I wouldn't say it's 100% pool -> miner traffic. I got this graph from my network engineer while they were troubleshooting our network speed and blamed it on me...

The vast majority is in fact going to poolmining.org though.

Blue is incoming traffic, Red is outgoing.

To be honest, what it looks like from that graph is that I'm requesting a bunch of shares, hearing no reply, and then receiving them all at once.