pyarl:I was having the same issues too. My freezing took up to a 5 minutes. Here's a possible solution. Its working for me:
http://codeeleven.blogspot.com/2007/12/visual-studio-2008-and.html
that didn't seem to work.. my problem is not so much with the toolbox intializing, but rather chronic freezups.
at this point, they mostly occur EVERY CHARACTER entered when editing an element's attribute, or, when selecting a different element.
It is virtually unusable at this point, and is causing a 3 hour edit turn into a 48 hour one. (the aspx doc has ~700 lines of code, and uses various ajax extension controls, ajax control toolkit 3.5 controls, and infragistics webgrid.)
Here are more symptoms:
-Any intellisense you have selected is lost when freeze ends
-Cursor often jumps to the beginning of the current line after a freeze, making attribute editing EXTREMELY frustrating
-Seems like the window layout of the environment is refreshing every time the freeze ends
-Cursor often disappears after a freeze, requiring a minimize-maximize of the environment to get it back.
At this point I am outsourcing some of my HTML editing tasks to external markup editors, or visual studio's XML editor, which works fine. Though when I need changes made that affect the underlying class, or direct attribute changes, it is just as slow to switch between editors.