php applications running slow

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http://www.linuxquestions.org – hello all i am facing one issue, after changing my server i have noticed the php application are working very slow on this new server. I have already compared the rpm of the new and old server. Also checked some of the file like resolve.conf etc . seems like its waiting for some time out thing and then loading the application , can any one of you suggest where should i check ? (HowTos)