I am a Virgin Media engineer and the stuff you posted looks good from an engineers point of view. Have you tried running a speed test from a different device, and if you haven't already run it besides your hub. Also make sure the all connections are tight. So that is connections at your hub, splitter and isolator. Feel free to PM me for anymore support. To PM me, just hover over my profile picture and click Send Message when the option comes up. Please don't post any personal info in this thread as it's public. If I've helped in any way, please give me Kudos and mark my response as a helpful answer!
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