Use a sub-stream for 'icon/tile level stuff' sending HD to a dashboard thats not in full screen is a heavy load. I have multiple substreams for different needs. Setting the framerate low is best for minimizing the stream, but also removing the audio and using best compression for the need can really optimize without the need for VLANS, seperate networks etc.
EG; A framerate of 10 or 15 still gives usefulness. I set my icons to use main stream when the icon is pushed. Another trick is to condense multiple images into a single feed. For example set 4 cameras to display in a 4 corner layout then display the aggregate. I use a BlueIris server to create a layout then pull from it via its web interface.
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