Chromium Blog: Do You Know How Slow Your Web Page Is?

Chromium Blog

News and developments from the open source browser project

Do You Know How Slow Your Web Page Is?

۱۳۸۹ مرداد ۶, چهارشنبه

The Web Timing draft specification presents a standard set of metrics for measuring web page load time across browsers. We’re happy to announce that in Chrome 6, web developers can now access these new metrics under window.webkitPerformance.
Measuring web page load time is a notoriously tricky but important endeavor. One of the most common challenges is simply getting a true start time. Historically, the earliest a web page could reliably begin measurement is when the browser begins to parse an HTML document (by marking a start time in a <script> block at the top of the document).
Unfortunately, that is too late to include a significant portion of the time web surfers spend waiting for the page: much of the time is spent fetching the page from the web server. To address this shortcoming, some clever web developers work around the problem by storing the navigation start time in a cookie during the previous page’s onbeforeunload handler. However, this doesn’t work for the critical first page load which likely has a cold cache.
Web Timing now gives developers the ability to measure the true page load time by including the time to request, generate, and receive the HTML document. The timeline below illustrates the metrics it provides. The vertical line labeled "Legacy navigation started" is the earliest time a web page can reliably measure without Web Timing. In this case, instead of a misleading 80ms load time, it is now possible to see that the user actually experienced a 274ms time. Including this missing phase will make your measurements appear to increase. It’s not because pages are getting slower – we’re just getting a better view on where the time is actually being spent.

Across other browsers: Web Timing metrics are under window.msPerformance in the third platform preview of Internet Explorer 9 and work is underway to add window.mozPerformance to Firefox. The specification is still being finalized, so expect slight changes before the browser prefixes are dropped. If you’re running a supported browser, please try the Web Timing demonstration and send us feedback.
Posted by Tony Gentilcore, Software Engineer

Google

برچسب‌ها: googlechrome , New Features , webkit , webtiming

برچسب‌ها

$200K 1
10th birthday 4
abusive ads 1
abusive notifications 2
accessibility 3
ad blockers 1
ad blocking 2
advanced capabilities 1
android 2
anti abuse 1
anti-deception 1
background periodic sync 1
badging 1
benchmarks 1
beta 83
better ads standards 1
billing 1
birthday 4
blink 2
browser 2
browser interoperability 1
bundles 1
capabilities 6
capable web 1
cds 1
cds18 2
cds2018 1
chrome 35
chrome 81 1
chrome 83 2
chrome 84 2
chrome ads 1
chrome apps 5
Chrome dev 1
chrome dev summit 1
chrome dev summit 2018 1
chrome dev summit 2019 1
chrome developer 1
Chrome Developer Center 1
chrome developer summit 1
chrome devtools 1
Chrome extension 1
chrome extensions 3
Chrome Frame 1
Chrome lite 1
Chrome on Android 2
chrome on ios 1
Chrome on Mac 1
Chrome OS 1
chrome privacy 4
chrome releases 1
chrome security 10
chrome web store 32
chromedevtools 1
chromeframe 3
chromeos 4
chromeos.dev 1
chromium 9
cloud print 1
coalition 1
coalition for better ads 1
contact picker 1
content indexing 1
cookies 1
core web vitals 2
csrf 1
css 1
cumulative layout shift 1
custom tabs 1
dart 8
dashboard 1
Data Saver 3
Data saver desktop extension 1
day 2 1
deceptive installation 1
declarative net request api 1
design 2
developer dashboard 1
Developer Program Policy 2
developer website 1
devtools 13
digital event 1
discoverability 1
DNS-over-HTTPS 4
DoH 4
emoji 1
emscriptem 1
enterprise 1
extensions 27
Fast badging 1
faster web 1
features 1
feedback 2
field data 1
first input delay 1
Follow 1
fonts 1
form controls 1
frameworks 1
fugu 2
fund 1
funding 1
gdd 1
google earth 1
google event 1
google io 2019 1
google web developer 1
googlechrome 12
harmful ads 1
html5 11
HTTP/3 1
HTTPS 4
iframes 1
images 1
incognito 1
insecure forms 1
intent to explain 1
ios 1
ios Chrome 1
issue tracker 3
jank 1
javascript 5
lab data 1
labelling 1
largest contentful paint 1
launch 1
lazy-loading 1
lighthouse 2
linux 2
Lite Mode 2
Lite pages 1
loading interventions 1
loading optimizations 1
lock icon 1
long-tail 1
mac 1
manifest v3 2
metrics 2
microsoft edge 1
mixed forms 1
mobile 2
na 1
native client 8
native file system 1
New Features 5
notifications 1
octane 1
open web 4
origin trials 2
pagespeed insights 1
pagespeedinsights 1
passwords 1
payment handler 1
payment request 1
payments 2
performance 20
performance tools 1
permission UI 1
permissions 1
play store 1
portals 3
prefetching 1
privacy 2
privacy sandbox 4
private prefetch proxy 1
profile guided optimization 1
progressive web apps 2
Project Strobe 1
protection 1
pwa 1
QUIC 1
quieter permissions 1
releases 3
removals 1
rlz 1
root program 1
safe browsing 2
Secure DNS 2
security 36
site isolation 1
slow loading 1
sms receiver 1
spam policy 1
spdy 2
spectre 1
speed 4
ssl 2
store listing 1
strobe 2
subscription pages 1
suspicious site reporter extension 1
TCP 1
the fast and the curious 23
TLS 1
tools 1
tracing 1
transparency 1
trusted web activities 1
twa 2
user agent string 1
user data policy 1
v8 6
video 2
wasm 1
web 1
web apps 1
web assembly 2
web developers 1
web intents 1
web packaging 1
web payments 1
web platform 1
web request api 1
web vitals 1
web.dev 1
web.dev live 1
webapi 1
webassembly 1
webaudio 3
webgl 7
webkit 5
WebM 1
webmaster 1
webp 5
webrtc 6
websockets 5
webtiming 1
writable-files 1
yerba beuna center for the arts 1

Archive

2025
- ژانویه

2024
- دسامبر
- اوت
- ژوئن
- مه
- آوریل
- مارس
- فوریه

2023
- نوامبر
- اکتبر
- سپتامبر
- اوت
- ژوئن
- مه
- آوریل
- فوریه

2022
- دسامبر
- سپتامبر
- اوت
- ژوئن
- مه
- آوریل
- مارس
- فوریه
- ژانویه

2021
- دسامبر
- نوامبر
- اکتبر
- سپتامبر
- اوت
- ژوئیه
- ژوئن
- مه
- آوریل
- مارس
- فوریه
- ژانویه

2020
- دسامبر
- نوامبر
- اکتبر
- سپتامبر
- اوت
- ژوئیه
- ژوئن
- مه
- آوریل
- مارس
- فوریه
- ژانویه

2019
- دسامبر
- نوامبر
- اکتبر
- سپتامبر
- اوت
- ژوئیه
- ژوئن
- مه
- آوریل
- مارس
- فوریه
- ژانویه

2018
- دسامبر
- نوامبر
- اکتبر
- سپتامبر
- اوت
- ژوئیه
- ژوئن
- مه
- آوریل
- مارس
- فوریه
- ژانویه

2017
- دسامبر
- نوامبر
- اکتبر
- سپتامبر
- اوت
- ژوئیه
- ژوئن
- مه
- آوریل
- مارس
- فوریه
- ژانویه

2016
- دسامبر
- نوامبر
- اکتبر
- سپتامبر
- اوت
- ژوئن
- مه
- آوریل
- مارس
- فوریه
- ژانویه

2015
- دسامبر
- نوامبر
- اکتبر
- سپتامبر
- اوت
- ژوئیه
- ژوئن
- مه
- آوریل
- مارس
- فوریه
- ژانویه

2014
- دسامبر
- نوامبر
- اکتبر
- سپتامبر
- اوت
- ژوئیه
- ژوئن
- مه
- آوریل
- مارس
- فوریه
- ژانویه

2013
- دسامبر
- نوامبر
- اکتبر
- سپتامبر
- اوت
- ژوئیه
- ژوئن
- مه
- آوریل
- مارس
- فوریه
- ژانویه

2012
- دسامبر
- نوامبر
- اکتبر
- سپتامبر
- اوت
- ژوئیه
- ژوئن
- مه
- آوریل
- مارس
- فوریه
- ژانویه

2011
- دسامبر
- نوامبر
- اکتبر
- سپتامبر
- اوت
- ژوئیه
- ژوئن
- مه
- آوریل
- مارس
- فوریه
- ژانویه

2010
- دسامبر
- نوامبر
- اکتبر
- سپتامبر
- اوت
- ژوئیه
- ژوئن
- مه
- آوریل
- مارس
- فوریه
- ژانویه

2009
- دسامبر
- نوامبر
- سپتامبر
- اوت
- ژوئیه
- ژوئن
- مه
- آوریل
- مارس
- فوریه
- ژانویه

2008
- دسامبر
- نوامبر
- اکتبر
- سپتامبر

Feed

Give us feedback in our Product Forums.

Google
Privacy
Terms