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I had a quick look at the page source during the test as I was curious to see how the test works and what it might be getting stuck at. I was actually quite surprised to see that it's just a lengthy set of comments with random characters, so what the browser receives is a very long webpage that mainly consists of invisible comments to bulk it up to the requested download size. Quite clever. So what I suspect is that some web filter is choking on the enormous web pages, which could be either some parental control (even if off) within the ISP, PC or even the virus checker scanning the page for anything suspicious and aborting the transfer after a certain amount of data is fetched. What I suggest is to try a https test. Most web filters (especially within the ISP) are unable to analyse secure connections and in turn will just let the data pass through just like a file download. You can ignore the security certificate warnings as they just mean the host is using a self-signed certificate. If the https test gets stuck on the larger block sizes, try disabling your virus checker temporarily or run a speed test on your mobile to see if the larger block sizes work.