We are constantly working on this script and some even more advanced code concepts to make it more optimized than it currently is. We also have some performance related settings that are in the admincp which are able to drop the load down at the cost of slower message response times. By default the script ships tuned for almost instant messages which is not ideal for large sites which don't have the hardware to support the extra load. So tuning of the sleep time and other time related settings to higher values should help drop the load from the script.
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