You should take a look at Gail's article with suggestions to post performance issues.
http://www.sqlservercentral.com/articles/SQLServerCentral/66909/
It might not affect performance, but you should beware of the dangers of using NOLOCK.
Luis C.
General Disclaimer:
Are you seriously taking the advice and code from someone from the internet without testing it? Do you at least understand it? Or can it easily kill your server?
How to post data/code on a forum to get the best help: Option 1 / Option 2