Zoom or Teams calls keep freezing or pixelating — how do I fix it?

Zoom HD video needs roughly 3.8Mbps upload and download — on an NBN plan with a low upload speed, that upload number is often the real bottleneck, not the download speed everyone focuses on. Use Ethernet if possible, close other bandwidth-heavy apps during the call, and check your router's QoS settings to prioritise video-call traffic if calls are a regular part of your day.