Technically, the fact that you will be decrypting the e-mail with your private key and encrypted mail with someone else's public key causes it to take a little longer. But 28 seconds longer doesn't sound reasonable. Monitor the performance of your processor and other system resources while you are opening or sending an encrypted item to see if there is a bottleneck there.
There are some documented issues the S/MIME control for Outlook Web Access running on a Windows XP Pro machine with SP2. See Description of the known issues with using Outlook Web Access on a Windows XP SP2-based computer.
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