However, the team Roon need a bit more detail to help you get this resolved. Would you mind filling out the support template below? You can copy and paste it in your reply, thanks!
Roon Core Machine
Include your operating system and machine info (Model, CPU, RAM).
Networking Gear & Setup Details
Your networking gear (model of routers/switches/etc), connection types (Wifi/Ethernet), and any firewalls, antivirus, or VPN software.
Connected Audio Devices
Specify what devices you’re using and their connection types, like USB/HDMI/Chromecast, etc.
Number of Tracks in Library
Tell us how large your music library is, eg. “30,000 tracks”.
Description of Issue
Tell us about the problem you’re having in as much detail as possible. Screenshots are always appreciated!
Are you still experiencing slow performance in Roon on the latest build?
Investigating diagnostics from your account, there’s evidence of downstream filtering in your network. It’s probably worth verifying that you’ve added the correct exceptions to your Windows Firewall, first off.
Do you have a VPN active on this network, or any enterprise-grade security?
Lastly, is this Core hardwired via internet to your Netgear router, and do you have any other networking equipment in your LAN? In particular, managed switches and access points are known to cause performance issues.
We’ll keep a close lookout for your response to promptly follow up with next steps. Thank you again for your patience.