So nice Thanks.
With substream on my 4 cam and the adjustment as in the wiki, 4-7% cpu load, when running at service and using my app on android to access it.
Mainstream: 1920x1080, constant, FR:12, BitRate:3072, Encodning: H264, IFrames:20
Substream: 704x576, constant, FR:12, BitRate:512...