Lately Outlook has begun to be really slow when first starting, and I'd like to find out why.

Outlook is set to open to Outlook Today, displaying 7 calendar days (not much there), all tasks by due date (quite a few entries but only 28 current; folder size 583k, no archiving), some mail folders, and using the standard style sheet. This amount of information has been increasing slightly, but the speed decrease has been rather sudden and dramatic. I havn't added any "fixes" or such lately, so the usual suspect for a sudden performance decrease can be ruled out.