[rockostrich]

McMaster-Carr's website is actually pretty impressive given how unassuming it is. It does a ton of pre-loading on hover and caching to make it feel like you're just navigating a static site. I didn't even realize that the page had a loading state until I enabled throttling from my network tab and immediately clicked on a link as soon as I hovered over it.

[dboreham]

Even more impressive is that it's something like 20 years old, and was basically the way it is now 20 years ago.

[niij]

See https://news.ycombinator.com/item?id=32976978