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What is Network Latency?
Network latency is how long it takes data to make the trip between a visitor’s device and your server. It’s usually measured as round-trip time (RTT) in milliseconds: the browser sends something out, the answer comes back, the clock stops. Page weight doesn’t come into it.
That last part trips people up. Bandwidth is how much data a connection can carry at once, like the number of lanes on a highway. Latency is how long the drive takes. A fiber line with plenty of bandwidth can still feel sluggish if every request has to cross an ocean, hop through a string of routers and squeeze past a crowded cell tower on the way.
And a page load is never one trip. Before your HTML starts arriving, the browser looks up your domain, opens a connection with a TCP handshake, sets up encryption and only then sends the actual request, with most of those steps costing at least one round trip. Say each trip takes 150 ms. Three or four of them and you’ve spent half a second staring at a blank tab before your server has done any work at all, and all of it lands in your Time to First Byte.
What this means for revenue
You can’t refactor latency away. It’s distance plus whatever network the shopper happens to be on, which is often a phone on a train.
It also multiplies. Your product page doesn’t come from one place: images from a CDN, a font service, the Trustpilot widget, a Klaviyo popup, the chat tool. Each new domain brings its own round trips, and on mobile data those trips get slower and less predictable. Shoppers never see the word latency. They see a product photo stuck as a grey box, and the ones landing from a Meta ad usually have nothing cached, so they wait out every trip.
What you do control is the distance and the number of trips. Serve from a CDN close to your customers, drop third-party domains that aren’t earning their place, and keep connections open between requests.
How Uxify helps
Reality measures every real pageview and segments by location and network speed, so you can spot whether shoppers in one country or on slow connections are waiting longer than everyone else. Its TTFB breakdown splits the wait into DNS, connection, TLS and server time, which tells you if the network or your backend is the slow part. Ask Uxi can dig into those numbers with you and suggest what to fix first. And Navigation AI loads the next page in the background before the visitor clicks, so after the first page the round trips are already done by the time they tap.
Network Latency FAQs
What’s a good network latency?
There’s no single number for every store, since it depends on where your shoppers are and how they connect. Someone near a CDN edge server will see a fraction of the latency of a shopper on another continent. Your own real-user data, split by country and device, is the benchmark that counts.
Is network latency the same as interaction latency?
No. Network latency is time spent waiting on the network. Interaction latency is the gap between a tap and the screen responding, and it usually comes down to JavaScript hogging the main thread on the shopper’s own device. A store can be quick on one and painfully slow on the other.
How do you reduce network latency?
Shorten the distance and cut the trips. A CDN serves pages and files from servers near your shoppers, HTTP/3 trims connection setup, and preconnect hints let the browser open connections to important third-party domains early. Our guide on how to optimize website performance covers more of the server side.