Chat Plugin not working - causes problem with mysql

Had major problems with it today upon installation. I would type something to chat and it wouldn't show up until a minute later. I had the experts at LiquidWeb (I have a dedicated server,and they're the best hosting around) check it out and they said the Chat plugin was backlogging mysql, causing it to crawl. We deactivated the plugin and everything improved. Re-activated it and the site crawled again. The Chat plugin was one of the main reasons for my purchase. Please let me know how to make this work. Thanks.