> With enough traffic, their edge servers will keep connections open to origin.

Except AWS CloudFront when used with a custom origin server (whole site acceleration) - their "clever" load distribution algorithm requires inordinate amounts of traffic for effective origin connection re-use.

I run multiple sites in the top 100k websites globally and am getting effectively zero origin connection re-use. Badgered them about it but all I got was a wontfix :-/

Sigh.