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Long delay when tabbing from field to field in forms or delay when entering/editing text

Go to tools, internet options, content, autocomplete and clear your forms cache.

Microsoft has released a knowledgebase article about this problem:

Delayed Response When Editing Internet Explorer Forms and Outlook Express May Take a Long Time to Start
http://support.microsoft.com/support/kb/articles/Q251/7/87.ASP

Malware may be the cause of your problem. Check out my troubleshooting link for more advice.