Any chance of an update for 0.17?

Desynchronized players should be dropped not auto-reconnect inviting a cascade failure.
Perhaps desync behavior could be a server config option?

Fresh-start vanilla server uses ~320MB so I would say a minimum of 512MB to give you some breathing room.

Consider using KVM to manage virtual machines and containers to host the games.
... 'course you'd want a modern distribution to host that with so you'd still have to update from CentOS6.

Tl;DR A higher frame-rate cannot help an ~~archaic~~ low-quality LCD that blurs. ... The Dell U3011 is a 7ms IPS. IPS is generally not recommended for gaming but they make some special low-blur IPS monitors for gaming. This is most likely a design "defect" in the monitor that cannot be fix...

You said 'best monitor' - what is the difference in resolution et. al. between the monitors?
What graphics card do you have?

It sounds like you are getting less than 60 fps rendering on the main monitor and vsync is on so you're dropping to a common-denominator.
Try turning v-sync (and g-sync) off.

I would also call this a bug it's just in the class of "Not Implemented Yet" or maybe "Won't Fix".

I think the website cert is incomplete. Browsers will automatically download other pieces of the cert chain (this does slow down access to the site) but most other tools will not. With wget I get: ERROR: cannot verify us1.factorio.com's certificate, issued by 'CN=COMODO RSA Domain Validation Secure ...

The steam flavor only list NONE under the drop-down for Beta.
It seems like we need a beta access code?

There is still an issue in 0.12.29.

I have a dedicated VPS running the server on Linux (Ubuntu) and it never downloads faster than 1Mbps and slows down to ~100kbps.
I download saves games to my machine from the server via ssh/scp at 20mbps.

When you move the force you are in you loose access to anything you plopped down before