I can report similar behavior, the site slowed down from about 9.30. And at nearly 10.30 It died in the poo hole. getting time out errors in IE.
I also notice the slowness the first time I log in when I have a new PM. That only ever seems to be a problem when you have the pop up PM alert activated. and Only occurs when the pop up comes up. you could possibly turn the pop up feature off and see if that makes a difference as at work the pop up doesn't work and I don't notice the speed drop.
Cheers
Simon
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