Hikvision or LTS LTD DVR not streaming fast on remote device
I noticed you have the sub stream settings on all cameras at 30fps. That many cameras trying to stream 30 frames per second is too much. I would suggest you bring the sub streams to 12 fps and that will make a difference on the streaming speed. The dvr will still record at full frames but for streaming purposes that is too high.
Recommended Setting for faster transmission