Check what other software is installed on the computer.  I had a computer recently that was a new HP having issues and when I removed a couple of the HP software it improved dramatically.

The main software with the issue was an Antivirus.  I can't remember the hp name for it but have it in my notes if needed.

I asked the same question a few months back. Got no response.

We're moving to Terminal Server environments, but one showroom (where the Sage server is installed)

has local pc installs.

All our Windows 10 pc's in that showroom are by far slower than Windows 7 Pro

You might want to start educating yourself with terminal servers...if you haven't already.

Our Windows 10 pc's only include standard Windows Defender for malware/virus protection.

Other ideas would be DNS. Possibly using an ip number instead of a server name on your Sage workstation settings.

That is..replace the target string for your server to an ip address instead of the server name.

Found here:

Right-Click the Sage Application icon, check out the target string of connection parameters.

Be careful. Copy that target string somewhere so you can get it back to original.