Wordpress php developer required

We require help following the unsuccessful commission of a local developer to expand our website basic booking system.

The upgrade added a word press cms to allow live availability to be shown to the user following selection of a price/service (pricing is drawn from an xml spread sheet)

The system searches suppliers in the users postcode area using both google geocode and a paid look up service and displays them with availability (as set in the cms)

Following hand over and testing of the live site the cms look up has got slower and slower to a point where the page freezes when checking availability

We need a developer to resolve this problem and an assess the entire booking system to ascertain and carry out any improvements

Ongoing we are looking for a developer to carry out regular work to websites including new frontend website and app for our inspection reporting site