Just some notes on bandwidth used while displaying cams with iVMS 4200 and a remote Hikvision DVR which has a mix of 20 different resolution cams as follows:

5ea 3840x2144 cams connected via ONVIF

15ea 1920x1080p cams connected via HIKVISION protocol

Main-Stream

20 cams displayed on 25 same sized tile screen main view window all cams set to main-stream 8.8MB/s

1920x1080p 25fps cam single window display Main-stream 2.1MB/s

3840x2144 15fps cam single window display Main-stream 2.4MB/s

Sub-Stream

20 cams displayed on a 25 same sized tile screen main view window all cams set to sub-stream uses 1.7MB/s

1280x704p 10fps cam single window display Sub-stream 1.8MB/s

352x288p 26fps cam single window display Sub-stream 1.7MB/s