The new (2013) web deploy based on file checksum is very interesting. But it's really too slow. I've tested it on a small web site on Azure (50 items aspx, images, dll, js,. etc). It requires about 3 minutes to check the site and create the list for updates. Too slow. It's completely useless. What a pity!
I noticed an high usage of outbound network on my PC and low inbound. I suppose that Visual Studio transfers all the files to the remote server for the check. Mine is only a guess.
http://blogs.msdn.com/b/webdev/archive/2013/10/30/web-publishing-updates-for-app-offline-and-usechecksum.aspx
