Okay, for those of us using IIS: If your users are getting Real Slow Loading on the pages, then do this:
1. Unset Expiring Immediately the documents (website -> properties -> http headers -> content expiration UNcheck)
2. Set a new http header, called "Expires", value "Thu, 19 Nov 1981 12:00:00 GMT".

Because if you use content expiration, it gives the current time as the expiring time. Great, IF your users are all synchronized to the atomic clocks (like you are, right?!). BAD if they are lagging behind. Grr...