@ar1111e
I personally checked your issue.
And saw machine is fine, network is fine but disk getting overloaded when you downloading files.
As server have 1 Disk only system also lagging because of disk load.
I also tested disk health and its fine too.
But still i asked dc support to look into it, maybe they can find any fault.
And it's not our sales department fault at all, in server spec you see it have 1x1TB and Atom Processor With 4GB RAM
You should not expect performance like E3-1230 or X3440 those are xeon cpu with 4 disk which we using in Rdp services.
And its a dedicated server we dont offer demo or refund in dedicated.
I will reply in ticket if i get any good news for you.
Next time buy server with SSD disk because in your server i see disk i/o is issue not network or cpu.
Proof: https://i.gyazo.com/ce8da7b7789095af3f6ea3fe83213b4a.png
Edit: Replaced server with Ultra Fast Rdp #1 As requested by you.
Best Regards
HostDZire