I think I know what's going on with YahooMail.
These delays are deliberate.
They are making people wait so the ads have X-seconds of exposure.
Go ahead, Yahoo. Issue a formal statement to the contrary!
Where are all those so-called crusading bloggers to uncover this?
Because if Yahoo is doing this, you can damn well bet it will spread!
Is that the kind of Internet you want? Ad breaks, even worse than TV?
Is YahooMail EVER Going To Be Fixed?
YahooMail Is Still Screwed
YahooMail: Redefining Suck