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.