What is surprising is that a 14kB page can load much faster than a 15kBpage — maybe 612ms faster — while the difference between a 15kB and a 16kB page is trivial.
That 14kB includes compression — so it could actually be more like ~50kB of uncompressed data
That makes it roughly agree with the advice I remember from the mid-90’s, that your site should be under 40k. (Not reaching that tipping-point was much more important, back when we were almost all on dialup, usually 2400 bps!)