As per the release notes, the IE8 is still not supported by Celerra manager hence I suggest you to try it by using the IE6 and test the same,
check also if you have too many old alerts showing up in the Celerra manager and if you can clean up few of old alerts.
reboot the control station, see if it helps. Celerra Manager is notoriously slow and the more objects it manages the slower it gets.
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Your feedback and response is appreciated.
we've a pair of NS-G8's that have always had problems with delayed response times. one more that the other actaully. we're currently on 5.6.47-11. In which code level is this resolved?