When I open my mail program I mostly see a twirling color disk---wait! It takes about 30 to 40 seconds for the program to start displaying my inbox. If I click on another mail folder the same thing starts over again. What can cause this incredible slowness, which is the same if I am online or offline??? I am using a iMac 27" desktop machine running OS 10.6.8 with Mail version 4.5 Update: I had many thousand email messages and, trying to solve this slowness problem, I archived most of them. The problem persists. A small 5kB email message sends the little color disk twirling for 20 seconds before it opens. Going off line and using Mail is just as slow, it is not my internet providers end which is slow, it is the mail program!