But the Client hardware hasn't changed. I have powered down the newer server and powered up the prior one, I then connected and saw no performance issues at all. There is something about the new, more powerful Server that is causing the issues. It's the only thing that changed.

Hi all, I appear to be having an issue with my factorio server after a hardware upgrade. I've just moved my headless windows server from a Pentium E6700@3.2Ghz Machine with 4Gb of RAM to a Xeon E3-1240@3.3to3.7Ghz with 16Gb, and am having strange performance issues that I'm struggling to figure out....