I recently experienced a slow down in my yahoo mail preview pane. It would take up to 5 seconds to display a message. That’s not acceptable. I gave thought to moving to gmail as my primary email account.
Then I found this:
I noticed that when the preview pane was loading Yahoo was pinging a list of URLs. I had nothing to do with the message I was trying to view. I opted out of the “program” and sped up my yahoo experience.