This is a complex problem that probably doesn't have a straightforward answer. Using the mantra 'make your website as fast as possible' means you won't get it w

This is a complex problem that probably doesn't have a straightforward answer. Using the mantra 'make your website as fast as possible' means you won't get it wrong, so it's worth doing, but you almost certainly get diminishing returns for that effort as you optimize for things like shaving off milliseconds and bytes. Yeah, that's fair. My point (really just repeating hearsay -- I should check that Google research still stands up!) is just that load time optimization apparently has a bigger benefit than you might expect, and the diminishing returns don't kick in until much later than you'd expect. Edit to add: and the post being discussed has a good point that there's a performance shelf at ~14KB, so a small improvement can have a big impact. Although... that said... if Google really thought sites should be as fast as possible, wouldn't they make a smaller GoogleTagManager.js script? A good question! They're definitely not the most consistent. The left hand says one thing, some of their thousand right hands do the exact opposite...