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To reduce the CPU load, the following is recommended:
Use different video camera streams for the purposes of displaying the video signal on the Video Surveillance Monitor, recording to the archive, and using video analytics. By doing this, you can, for example, display a lower quality video on the Monitor, and record a higher quality video to the archive.
Complete guide Configuration of multistream video
Use automatic selection of video camera streams to display the video signal on the Video Surveillance Monitor.
Complete guide Configuring automatic selection of video stream for display