If you are wondering why your blackberry use to hang thereby making it slow down,it is due to the ability of blackberries  to keep your  past activities.To make it  normal again,you have to clear your event log.
This can be done by following the steps below
(+)make sure your phone display homescreen
(2)press and LGLG together(you will see a page list)
(3)click on option then clear log
(4)that is all

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