Share your experience!
You might want to clear the call history
Had the same issue, contacts would load but when I selected one it would not show the detail.
Cleared App data and tried again, workedfor approx 2-3 minutes and then back to slow ness. Contacts load quickly enough but opening any contact takes approx 20 sec to show the detail.
Using a third party dialer and contacts app is a work around but surely a core function like this should just work...
Will watch the forums for updates and solutions.