I'd say QV 10 compared to QV 8.5 would be slower..
At QV 10 you have thumbnails of the qvws and the server may check session access to show files or not...
You mentioned IE a couple of times... did you try to use other browsers?
What is the performance if you try to access the server using QV Desktop?
Are you using regular NTFS authentication?
Did you try to open the access point and then changing the visualization to details?
A colleague of mine tried using the ajax client on an iPad and it was much faster.
When using the "Open in Server" function in the QV Desktop, the list of folders appears in 2 seconds.
We are using NTFS authentication.
And, yes, I changed my view to Details a few months ago, and it still takes 30 seconds to a minute to display the list of documents each time I open Access Point in IE.