WHAT IS JITTER?
Jitter describes variation between latency samples — consistency rather than headline capacity.
VARIATION BETWEEN SAMPLES
If repeated latency samples arrive around the same time, response is consistent. If they swing widely between fast and slow, the path has more timing variation. Jitter summarizes that variation and should be interpreted beside the underlying latency samples.
WHY REAL-TIME TRAFFIC CARES
Voice, video calls, multiplayer games and remote interaction need data to arrive predictably. Applications can buffer some variation, but large or repeated swings can contribute to uneven audio, delayed interaction or visible stalls even when download throughput is strong.
A jitter value without average latency, sample count and test conditions has limited diagnostic value. Compare repeated runs under similar conditions.
COMMON CAUSES TO INVESTIGATE
Busy Wi-Fi airtime, retransmissions, saturated links, changing routes and competing local traffic can all increase timing variation. A browser measurement can show that variation occurred on the tested path, but it cannot identify every queue or radio event responsible for it.
A FAIR COMPARISON
Test the same destination from the same device, first under quiet conditions and then under the condition that causes the symptom. An Ethernet comparison can help separate local Wi-Fi variation from a problem that remains beyond the wireless hop.
RUN JITTER TEST→Reviewed for technical wording, measurement boundaries and links to the current 0bps toolset.
External references are provided for standards, definitions and deeper technical context. 0bps explanations remain independently written.