Did you read the sticky threads in this forum? Follow the steps listed there, and when you post a performance problem with the combine, it would be very helpful to post the type of browser you are using, and exactly what you have tried, as well as the results from each attempt. Be specific, "It dont do anything..." is not very helpful.
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Warning this is strictly Orions McPhees Opinion, it may or may not have any bearing on events true or imagined