Note that these tests were conducted on a MacBook – presumably running OS X. Apple invested a lot of time optimizing Safari and OS X for low power usage, so it's not exactly surprising that Safari wins in most cases. It would be very interesting the see a comparison with Windows and Linux (if possible on the same hardware).
Lots of other commenters have remarked about the lacking rigor and narrow scope of the tests. It would be interesting (and time consuming) to re-run this test with many more parameters: * Fresh install of OSX vs fresh install of Win8.1/Win10 on capable Macbook. (I'm unsure about Linux or other distros running on Macbooks, add that to the test if it's feasible.) * Javascript enabled and disabled. * Flash enabled and d…
Why Windows 7 and not Windows 10? The article is capturing fascinating data, and I'd like to see how Edge stacks up.