DarkShadow: Yeah you'll need a 7490, the 7390 is not powerful enough.
Thanks for providing your computer specs. Can you please try to copy a file between your computers to confirm the network cards can actually do a gigabit?
Except that some HDDs can't keep up with gigabit speeds, and local to local might be IPv6 and might have different performance profiles.
Technically, if you wanted to confirm local network speed you should host a file on a SSD on one machine and do a copy to nul: from the other machine, while monitoring CPU, disk queues etc, or get iperf and try TCP tests across the LAN.
Are you running any AV software? A firewall? what power management settings do you have in place?
The point is, as I have made many times, gigabit is so fast it highlights limitations in networks and PCs that previously haven't been an issue for even 200Mbit WAN links.
Of the dozen or so Fibre MAX 'performance' issues that have been escalated and I have looked at, about 11 ended up being in the customer network, precisely 1 was outside our network and there weren't any that were due to issues with the service design. (This isn't to say it's never happened - it's just that the particularly curly issues on Fibre MAX are raised to me and a couple of others, and this is our experience so far)
We have a golden system using a known Router and a known computer setup that we use in exceptional cases to prove there's nothing wrong with the network or PC/software. I don't know anything of consequence about 2D's network, but honestly I've heard very little about issues with gigabit from any major ISP.
The only cases I have seen where the windows 10 app didn't give great results were when the gig eth port was on a USB bus, or a shi**y chipset - or the router wasn't up to scratch. We even had one instance where replacing a cat5e cable with a new Cat6 cable dramatically improved performance.
It's also entirely possible that the 2D speedtest servers aren't up to scratch - I don't know.
Cheers - N