[wubsitesgood]

Some of the tests in the article are run on Desktop Chrome using a "cable" connection speed instead of 4G, which looks to have about a 6x faster round trip time than their 4G does. Those results are a little less impactful but still significant (many seconds faster still in some metrics).

More testing environments would make the results more or less significant, as you'd expect.

In ideal browsing conditions, the impact will be more minor, and in the spotty barely 1-bar connection you mention, the difference would be much more dramatic than the 4G examples in the post.