It really depends on who your clients are and where they are.
https://www.mcmaster.com/ was found last year to be doing some real magic to make it load literally as fast as possible for the crapiest computers possible.
https://www.mcmaster.com/ was found last year to be doing some real magic to make it load literally as fast as possible for the crapiest computers possible.
Basically, looks like someone deliberately did many right things without being lazy or cheap to create a performant web site.