I having been testing out some VPN services to find out which one works for me. One of the most important things is speed, so I need to have some way to measure that. I turned to the online testers, but I have gotten wildly varying results between them (tests run 2-4 times per site).
All this was on the same machine, same browser, same VPN, same server.
Speedtest.net gave very high speeds.
On Speedof.me things slowed to a crawl.
FWIW, I'm running Firefox with Ublock Origin (deactivate), UMatrix (deactivate), HTTPS everywhere, Decentralize, and Self-Destruct Cookies and a few other plugins
And Nertperf.tools and dslreports.com were right in the middle (these two supposedly use the same testing infrastructure).
How can I be sure which is accurate. Is there a more comprehensive website, or some kind of program I can download (OS X and/or Android) that will give a better picture?