Some pages of my site loading to slow

Some pages of my site loading to slow

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Job Description

Hi,

I have Text Ad Exchange script written in php and work with MySql.
Recently I have upgraded my hosting account so they moved my site to server which have updated versions of MySql and PHP. Now I have problem with few pages on the site which loading to slow. One of the page showing "Maximum execution time" error, but others doesn't show any error. The script is old so probably some code is not compatible with new version of MySql and or PHP.