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My main home computer is a recent Win10 desktop with a Gigabyte B450M motherboard (Ryzen 3600, 32GB ram). The motherboard has a Gigabit Ethernet port connected to a regular Gigabit switch, then to a Linksys Velop Router/AP that is connected to my Internet provided cable modem. The cabling is all CAT5e. The Internet package is 400mbps down and 50mbps up.

I can run a speed test from the Velop router (via its web interface) and the results I'm getting are a consistent 450mbps DOWN/56mbps UP. And I get this results essentially every time I run the test.

Now, on my desktop, I use the Ookla speedtest application (not the web site) and I get a different result all the time. Results range from 220mbps to up to 388mbps. I've conducted daily tests for the last month and the reported average is 288mbps DOWN/56mbps UP.

Why would my desktop computer have issues reaching the full speed of my Internet connection? Anything I could test to find the cause? Thanks.

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  • If you use other websites that test your speed what is your performance like?
    – Ramhound
    Feb 10, 2021 at 13:33
  • Which server do you select in the Ookla Speedtest app? Does it have one offered by your ISP?
    – user1686
    Feb 10, 2021 at 14:29
  • @Ramhound I tried using other sites but I often get even slower speeds. I find the Ookla app to be the solution that shows the speed the closest to the test from the actual Velop Router/AP.
    – jmbouffard
    Feb 10, 2021 at 23:50
  • @user1686 I tried different servers and the ones close to my home and operated by the big telcos provide the fastest speeds, but still not up to the 400mbps I would expect. My provider has a speedtest online but their server is 160 miles away from my home and I get slower speeds when compared to the Ookla app.
    – jmbouffard
    Feb 10, 2021 at 23:52
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    Do you happen to have a second computer that you could connect to the same Ethernet, and use iperf3 to run a completely local test between the two? Have you tried connecting the desktop directly to the modem? (Some routers have things like parental filtering which are quite CPU-demanding compared to basic forwarding.)
    – user1686
    Feb 11, 2021 at 10:40

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