Hauptwerk User Manual wrote:CPU - The meter indicates the approximate estimated peak audio CPU load/stress. Red indicates audio CPU overload or audio driver synchronisation issues and likely audio glitches (try reducing the polyphony limit, increase the audio buffer size, or check for updated audio drivers). More specifically, the meter shows the amount of time that Hauptwerk is taking to calculate each chunk of audio as a fraction of the amount of time the audio driver has allowed Hauptwerk to do it. Note: the meter doesn't show the same thing as the operating system's overall CPU usage figures. Hauptwerk's CPU meter is specifically designed to show the risk of audio glitches, which is heavily dependent on audio driver performance and the performance of other computer hardware/driver components, as well as overall loads on the computer's CPU(s).
Are you using your mainboard integrated audio card? Most probably it is not enough and it is failing to keep up with the amount of audio processing required by the sample set you are trying to use.