Digi-Key has what has to be a top contender for fastest order processing & shipment of any company that does e-commerce ever. No exaggeration, it's almost inconceivable how quickly they will pack up and ship out your order. Especially when considering most orders likely contain many different, intricately small parts each of varying quantities. For example, I've seen YouTube videos from AvE who lives in Canada, where he ordered a few ICs late-ish the previous night and UPS dropped them off at his door the next afternoon. And this isn't a one-off occasion, it's consistent.

McMaster-Carr might be comparable, though. At Georgia Tech, a MC order at like 9AM could realistically be received at like 1PM with the cheapest shipping option. Usually the slow link was GT Post Office.

But that's because MC has a warehouse really close to Atlanta.

What? They have the best website of all the electronics distributors.

Which distributor has a better website?

It's not electronics, but for many years now McMaster-Carr [1] has impressed me as a highly practical and efficient website.

[1] McMaster.com

I personally prefer mouser over digikey.

Funnily enough, when I first stumbled on them (about 15 years ago) I too assumed they were a China-based company for some reason. It wasn't until the first shipment arrived and I finally noticed the sender address that I realised they were States-based. I still use them for most of my parts, they're amazingly quick to process and ship, and the free shipping for $50+ orders is awesome.