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Latency vs jitter

Latency is delay. Jitter is inconsistency.

You do not need jargon to understand the difference. Delay is how long something takes. Jitter is whether that time stays steady or jumps around.

Traders feel the second problem more often than the first. A route can look fast in a single test and still feel unreliable when it starts wobbling under load.

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Latency
The average delay.
Jitter
The wobble around that average.
Why it matters
Traders need consistency when the market moves fast.

Why the difference changes the outcome

A route with 20 milliseconds of delay that stays at 20 can feel easier to live with than a route that bounces between 5 and 50. The average may look similar on paper. The experience is not.

That is why clean routing keeps showing up in discussions about execution quality. The trader cares less about a spec and more about whether the session behaves in a way they can trust.

How to think about it

Latency tells you how long the path takes. Jitter tells you whether the path is calm. If the market is fast, the calm path usually feels better than the path with a slightly better average and a much worse wobble.

That is the practical answer. You are not chasing a number for its own sake. You are trying to make the network less distracting when the market is already doing enough.

Simple rule

If the average looks fine but the session still feels bad, jitter is probably part of the story. If the session feels calmer on a cleaner route, you have your answer.

FAQ

Latency is the delay itself. Jitter is how much that delay changes from one moment to the next.

Both matter, but jitter often feels worse because inconsistency makes sessions unpredictable.

If a tool claims low latency but does nothing about consistency, it may still feel rough under load. Traders want a route that stays calm.