When is a form too long and too slow?

I have a form that is longer than one page (and it can be slow depending on what is submitted)

Would it be acceptable design to have a submit button that became disabled (while waiting for the server to respond) with a progress bar inside the button?

Comments
Conner's Gravatar I like your blog very much! Could you please in one of your articles make a review of rapidshare search engines? As for me, I use rapidsharemix - rapidshare search engine( http://www.rapidsharemix.com ) . Would like to learn more
# Posted By Conner | 12/19/09 3:36 PM
Dana's Gravatar Thanks for the information!!!!!!!!!!!!!!!!
# Posted By Dana | 1/20/10 2:43 PM
BlogCFC was created by Raymond Camden. This blog is running version 5.9.1.002. Contact Blog Owner