To fix the tab delay, just unimmunize the entries from spybot:

http://msmvps.com/blogs/donna/archive/2009...is-enabled.aspx
http://www.neowin.net/news/main/09/04/02/i...sealed-the-deal


You just need to clear your HOSTS file. However, do not panic, since you can add the entries to IE8's add-on "InPrivate Filtering". This also lets you block adverts:

http://www.neowin.net/news/main/09/04/02/i...nprivate-filter

With these "fixes", I'm sure you'll find your browsing experience much better.