In 2009, Bluehost introduced a new feature called CPU throttling. CPU throttling (at Bluehost and similar hosting services) refers to the process of reducing user's CPU usage in whenever the particular user is pulling "too much" server resources at one time. At that particular time, Bluehost would freeze (or drastically reduce) client sites' CPU usage substantially. This effectively shut down clients' websites hosted on the Bluehost server for several hours throughout the day.
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