Product

Round-Trip Time

Deep dive into network latency on the web: an interactive report based on Round-Trip Time (RTT) data from Chrome UX Report (CrUX).

Overview

This is an interactive report to explore network latency on the web. It addresses questions such as: What is the current health of the network? How does it vary by domain ending and website categories? It uses Round-Trip Time (RTT) data from Chrome UX Report (CrUX).

RTT shows the time it takes for a request to go from a client to the server and back (round-trip). In CrUX, it is estimated on the initial page load navigation using navigator.connection.rtt and measured in milliseconds. CrUX provides 75th percentile (p75) aggregated for all domain visits during the past 28 days.

RTT is a diagnostic metric that helps you to understand your audience network connection. Instead of relying on 2G, 3G, or 4G labels (which are also based on RTT), it provides better visibility to your visitors' connection. For example, if your site's average RTT is slow, performance metrics like TTFB or LCP are also likely to be impacted. Consider loading some parts of your site conditionally (learn more). But if RTT is fast and you still have slow metrics, you need to optimize your site. To measure your site's performance, use our free Site Speed Test.

Methodology: we took RTT data for the top 50,000 origins of CrUX's October 2026 list, collected on November 11, 2026 (excluding empty values, which resulted in 49,769). Here are the median (p50) values by device type:

Mobile

147ms

Desktop

92ms

All devices

133ms

On the average origin of the list, 73% of the traffic comes from phones, and the median on all devices (133 ms) lies closer to Mobile's (147 ms) than to Desktop's (92 ms). The table below provides a detailed breakdown of the RTT distribution with percentiles and statistics:

RTT by device over the 49,769 origins of CrUX's October 2026 list with a value, each origin's value is its p75 RTT over 28 days: a row gives the percentiles, min, avg and max of its origins' values in ms, and the origins it counts
Device	p10	p25	p50	p75	p90	min	avg	max	total
Desktop	60ms	72ms	92ms	123ms	169ms	9ms	106ms	1362ms	40,170
All devices	81ms	99ms	133ms	186ms	249ms	30ms	151ms	2617ms	49,769
Mobile	93ms	113ms	147ms	201ms	258ms	45ms	164ms	2620ms	48,372

Geography

Let's explore RTT by domain ending. On all devices the median runs from 62 ms (.nl) to 357 ms (.ng) over 70 country endings, 114 ms in the middle. Distance shows in Australia and New Zealand: .au (135 ms, 46th) and .nz (171 ms, 58th) stand above the middle, and on desktop, where the mobile network plays no part, they stay slower (108 ms and 141 ms) than .jp (60 ms) and .tw (51 ms). We computed regional RTT using top-level domains (TLDs). For example, .nl represents the Netherlands, and .ca is Canada.

The map below displays the median RTT (p50). And the table lists the top 10 fastest and slowest domain endings. You can interact with the map and use the device switch to change aggregation.

<100ms

100–150ms

150–200ms

200–250ms

>250ms

Median RTT (p50) by domain ending on Desktop over CrUX's October 2026 list, each origin's value is its p75 RTT over 28 days: the 10 fastest and the 10 slowest of 70 country domain endings, the ones with the most origins (18,673 origins on any device; endings used generically, such as .io, left out), each row the median of its origins' values in ms
Rank	Domain ending	p50
1.	Taiwan (.tw)	51ms
2.	Netherlands (.nl)	53ms
3.	Switzerland (.ch)	54ms
4.	Sweden (.se)	59ms
5.	Japan (.jp)	60ms
6.	Norway (.no)	60ms
7.	Israel (.il)	62ms
8.	France (.fr)	63ms
9.	Czechia (.cz)	63ms
10.	Ireland (.ie)	63ms
…	…	…
61.	Uzbekistan (.uz)	159ms
62.	Kazakhstan (.kz)	159ms
63.	Egypt (.eg)	160ms
64.	South Africa (.za)	168ms
65.	Saudi Arabia (.sa)	192ms
66.	Sri Lanka (.lk)	198ms
67.	Iran (.ir)	215ms
68.	Pakistan (.pk)	219ms
69.	Kenya (.ke)	273ms
70.	Nigeria (.ng)	354ms

Categories

By website category, the median RTT on Desktop runs from 79 ms (Shopping) to 105 ms (Jobs & Education): the slowest stands 33% above the fastest. To classify websites, we used Chrome's topic classifier (chrome://topics-internals/). Below is an interactive table to explore the network latency across different clusters of the web:

RTT by website category on Desktop over the 40,170 origins of CrUX's October 2026 list with a value there, each origin's value is its p75 RTT over 28 days: a row gives the percentiles, min, avg and max of its origins' values in ms, and the origins it counts; an origin counts in each of its categories, and a category shows with 1,000 origins or more
Category	p10	p25	p50	p75	p90	min	avg	max	total
Books & Literature	60ms	70ms	95ms	121ms	151ms	41ms	102ms	389ms	1,043
Games	58ms	69ms	87ms	111ms	145ms	35ms	97ms	413ms	2,161
Autos & Vehicles	60ms	68ms	81ms	104ms	129ms	35ms	91ms	439ms	1,033
Online Communities	60ms	74ms	99ms	129ms	177ms	32ms	110ms	442ms	2,123
Shopping	59ms	66ms	79ms	100ms	129ms	30ms	90ms	452ms	4,005
Arts & Entertainment	62ms	75ms	99ms	131ms	185ms	9ms	112ms	478ms	7,573
Sports	59ms	67ms	80ms	103ms	151ms	36ms	95ms	480ms	1,640
Law & Government	64ms	78ms	104ms	144ms	183ms	9ms	117ms	541ms	2,688
Finance	60ms	73ms	93ms	123ms	172ms	36ms	106ms	544ms	2,174
News	59ms	68ms	84ms	111ms	156ms	33ms	98ms	615ms	5,519
Jobs & Education	64ms	78ms	105ms	144ms	198ms	26ms	121ms	624ms	4,452
Computers & Electronics	62ms	76ms	97ms	125ms	163ms	32ms	107ms	880ms	2,494
Internet & Telecom	63ms	76ms	99ms	130ms	172ms	31ms	111ms	931ms	2,561
Travel & Transportation	59ms	67ms	82ms	105ms	134ms	39ms	93ms	960ms	1,238
Business & Industrial	60ms	69ms	89ms	117ms	167ms	33ms	103ms	1251ms	2,638
All ☼	60ms	72ms	92ms	123ms	169ms	9ms	106ms	1362ms	40,170
Adult Content	63ms	76ms	99ms	126ms	166ms	29ms	109ms	1362ms	4,266

Next: This is the first iteration of the report. We plan to expand its functionality once more RTT data is available in CrUX. Feel free to contact us via Email or Twitter and suggest your ideas and improvements.