Does it slow down for all users?
When it slows down and you create a new session does it start slow?
When it slows down if you it refresh in the browser is it still slow?
The 32bit app pool can use far less memory than the 64bit and maybe the GC is kicking is faster for 32bit and collecting controls abandoned by the app which can slow the browser.
In my experience the 64bit is a lot faster of the 32bit especially under stress because it almost never pages the memory.
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