Bandwidth vs Latency: What's the Difference?
Blog post from Video SDK
Bandwidth is a connection’s maximum data capacity, measured in bits per second, while latency is the delay in data delivery, measured in milliseconds; although related through network behavior, they require different diagnoses and remedies. In video calls, insufficient usable throughput or goodput typically causes blurry, blocky, or frozen video, whereas high latency and jitter disrupt conversation timing, with interactive calls generally requiring under 300 ms glass-to-glass delay and ideally under 150 ms round-trip time. Higher-capacity internet plans rarely improve meaningful latency because distance, routing, queuing, bufferbloat, Wi-Fi interference, encoding, and jitter buffers usually dominate delay, while moving media servers closer, using UDP-based WebRTC, adaptive buffering, congestion control, and low-latency encoding can help. Actual video performance depends more on sustained throughput, packet loss, and path conditions than short TCP speed tests, and encoder settings should account for goodput and headroom. For group calls, simulcast or scalable video coding allows each participant to receive an appropriate quality layer, while protocol choice reflects use case: WebRTC supports low-latency interactive communication, whereas HLS and DASH trade several seconds of delay for scalable one-way streaming.
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