Troubleshooting : Solutions by issue type : Video viewing issues : Live feed delay
 
Live feed delay
Before QuickTime will begin playing a video stream, it must buffer a few seconds’ worth of data. The time that QuickTime requires to do this may result in a few seconds’ difference between what you see happening in the live video feed, and what is happening in reality now.
You can minimize this by:
Changing the camera’s Resolution setting to the lowest acceptable resolution
Changing the camera’s Resolution setting to the lowest acceptable resolution
Improving the bandwidth and latency of your network