mysql optimization

mysql taking too much cpu making my website too slow especially when a certain number of users log in. would like to optimize it to make my website faster or lower cpu load. I need the work done asap. At least several years experience required. You can see my ratings on guru com. Prefer India based database guy. I am located in USA. The most experienced and fair priced gets the task. I need references or feedback on you or your company. Thank you