Problem with streaming 1080p camera to one PC

Hi, I've got problem with 1 cameras on my PC. Camera is TVT TD9523M. It streams video to 3 PC and records to one DVR - all simultaneously. The network is mostly 100mbit unfortunately. When streaming 1080p it delays with 5seconds or more for example. CPU is AMD Sempron LE-1150 and videocard is integrated, dont know the model. When watching with 352x288 resolution stream is realtime, but sometimes it gets blurred like resolution is getting lower or there is not enough network capability of the camera or sth like that. Don't know the reason. Could be this the problem? Thank you.