Jitter is the variation in the delay of received packets and is measured in milliseconds (ms). High jitter can cause packets to arrive out of order, which would lead to erratic audio and video freezes in a real-time communication service like video conferencing. Bandwidth and latency are important metrics but are less likely to cause the symptoms described if they are within acceptable performance ranges. CPU usage is a device performance metric, not a network performance metric, and while it could affect overall device performance, it is less likely to be the direct cause of the described video conferencing issues.