Leaderboard

May I suggest you eliminate the router for testing, and connect directly to the modem, then test New York. Testmy.net is explain there is an issue beyond what the ookla server running within the ISP network is showing.

I'm sorry your question previously went unanswered. Before anything can truly be determined you'll need to test a little more. First go to mirrors and change to another server near you, try a few different ones. You want to establish that it's not just the connection out of Dallas. If other servers vary widely still, same kind of pattern you've been seeing, then you'll want to establish that it's not your browser. Do the test using the server that returned the most favorable results in more than just Firefox (like I see you've been testing with). Try Chrome. If multiple browsers also do the same thing then you should try another machine. If possible try testing on another computer or device on the same network. It's best if the machine is known to perform well on other connections using TestMy.net, this gives a known baseline to work from. For instance, I can take my laptop to anyones home who has a connection slower than mine and pretty much know for a fact that any degradation in performance is on their network. Another thing to do is make sure you test with more consistent sizes between tests. When you're having issues the auto sized tests aren't always the best. On your connection I'd try 50 or 100 MB manually selected. On https://testmy.net/download you'll see a "Manual Test Size" drop down. If you haven't already you should unplug your router and modem briefly (10 seconds) to make sure we're starting fresh. I just had a major issue yesterday because my router was in dire need of a reboot. I had transferred hundreds of GB of data over wifi over a short period... guess it was too much for the ol' Netgear Nighthawk. Quick power cycle, less than a minute and everything was back online and running perfect again.