Can someone explain why the speed test built into my UDM Pro is showing completely different results from what I’m getting on my computer?
I have CenturyLink and Xfinity connected to the UDM Pro.
CenturyLink is supposed to be 2.5 Gbps down / 1 Gbps up, connected through a 10G link. The UniFi speed test keeps reporting terrible download speeds on that connection, sometimes around 300 Mbps.
Xfinity tests pretty much as expected.
Meanwhile, Speedtest.net on my desktop consistently gives me around 930 Mbps.
Everything is updated, and I haven’t noticed any major problems with normal internet use.
So is UniFi measuring something differently, or is my CenturyLink connection actually underperforming?
What’s between your desktop and the UDM Pro? And are you sure your desktop’s speed test is actually going through CenturyLink? With two WAN connections, I’d verify that before comparing results.
@auto.loser Desktop goes through a gigabit switch. Cat6 wiring throughout the house. CenturyLink is connected to the UDM through 10G. I assumed getting 930 Mbps on my PC meant the 2.5 Gbps connection was fine.
Ah, there’s your first misunderstanding. 930 Mbps is pretty much what you’d expect from a gigabit Ethernet connection. You’re testing the limit of your desktop’s LAN path, not the full capacity of your internet service.
My money is on the speed test server UniFi is choosing. I’ve seen the built-in test give wildly different results depending on the endpoint. Try a few independent speed test servers and compare them. Just don’t expect to measure 2.5 Gbps from a PC behind a gigabit switch.
I’d separate LAN performance from WAN performance before changing anything. For WiFi specifically, NetSpot’s Active Survey can run iPerf3 tests against a server on your local network. You can compare TCP/UDP throughput and UDP jitter in different areas without involving your ISP. Useful if you’re trying to figure out whether the APs or wireless connection are the bottleneck. But it won’t explain why the UDM Pro’s own speed test reports 300 Mbps. That test runs on the gateway, not through your WiFi.
@Repulsive_Trade303 Interesting. I was actually wondering whether my APs or switch were affecting the results. So running iPerf3 locally would tell me if the network inside the house is performing properly?
It would help you test the path between your client and the iPerf3 server. Just remember that your gigabit switch can cap those results too. And even a perfect local iPerf3 test doesn’t prove CenturyLink is delivering 2.5 Gbps. Different test, different question.