"Lag" gets used as a catch-all word, but a delayed response, a jumpy picture, and a frozen frame are actually different problems with different causes. This page focuses on delay and choppiness specifically — for video that stops entirely, see our freezing guide instead.
What people describe as "lag" usually breaks down into three distinct, separately-caused issues:
How long it takes for what you say or do to actually reach the other person. This is the plain "there's a delay" feeling, where conversations start to overlap because each person starts talking before they've heard the other one finish.
Not a constant delay, but a delay that keeps changing — sometimes fast, sometimes slow. This is what makes video look like it's jumping or stuttering rather than just running a bit behind consistently.
Some of the data describing the video or audio simply doesn't make it, which shows up as blocky visual glitches or brief gaps in audio, rather than a smooth delay.
As a general point of reference from broader networking knowledge — not a number we've specifically verified against Chatzyo's own infrastructure — delay under roughly 100-150 milliseconds tends to feel natural in conversation, while delay well past that starts to feel like the awkward overlap you get on a bad international phone call. These are rough reference points, not hard thresholds Chatzyo enforces or measures for you.
It's easy to assume lag is always a connection problem, but encoding video in real time is genuinely demanding work for your device's processor. If your CPU is struggling — an older device, too many other things running — frames can get dropped or delayed before they even leave your computer, which looks exactly like a network problem but isn't one. Hardware acceleration, which shifts this work to your graphics hardware instead of the CPU, is worth confirming is turned on in your browser's settings if this might be the cause.
This is worth knowing honestly rather than glossing over: data takes a real, physical amount of time to travel long distances, even at close to the speed of light. A call between two people on opposite sides of the world will have some baseline delay that no amount of local optimization removes — it's a property of distance and physics, not a flaw in the connection. This is part of why a call between two people in the same country often feels snappier than one spanning continents, regardless of how good either person's individual connection is.
A VPN is a legitimate privacy tool — see our guide on IP visibility if that's why you use one — but it's honest to say it can add latency, since your data is taking a longer path through an extra server before reaching its destination. If lag is specifically the problem you're trying to solve, temporarily testing without a VPN is a reasonable way to see how much of a difference it makes, rather than assuming either way.
Beyond the causes specific to lag and jitter above, general connection stability — a wired or strong Wi-Fi connection, not too many other devices competing for bandwidth, no large downloads running in the background — matters too, and that ground is covered in more depth in our connection errors guide rather than repeated here.
Usually a combination of connection delay (latency), inconsistent timing between data packets (jitter), or your device's CPU struggling to encode video fast enough.
Yes, often. Routing your connection through an extra server adds distance and processing time, which shows up as added latency.
Yes, genuinely. Data has a real, physical travel time across long distances, so a call between two far-apart locations will have at least some baseline delay that no amount of optimization removes entirely.