What is the Fastest/Optimized way to update Sharepoint User Profiles?

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SharePoint

Hi,

I'm updating around 100,000 sharepoint user profiles programmatically, in C#, using the UserProfileManager.

In my tests, it appears that each user profile update is taking me 0.7 seconds to finish. Is this about right? At this rate, it'll take me 17.5 hours to complete the update process.

I'm using code similar to below:

using (var spSite = new SPSite(txtUrl.Text))
{
    var spContext = SPServiceContext.GetContext(spSite);
    var userProfileManager = new UserProfileManager(spContext);

    ...

    var accountName = "MyAD\\mickey.mouse"; // hard code for now
    var userProfile = userProfileManager.GetUserProfile(accountName);

    userProfile["WorkEmail"].Value = "mickey.mouse@gmail.com";

    userProfile.Commit();
}

Am I doing anything wrong? Any better way to do this?
I'm hoping I'll be able to finish the update process in a few hours only.


Thanks in advance.

Rafferty