“Change almost never fails because it's too early.
It almost always fails because it's too late.” ― Seth Godin
1953 2013Formula 1 Pit Stops
https://www.youtube.com/watch?v=RRy_73ivcms
67s 3s
$
€¢
£¥
$
€ ¢
£
¥
Speed SellsRevenue
Cash FlowInvest
IT budget
Salary
What is theWebPerf
Business Case?
Every 1s faster = 2% higher conversion
2.2s faster = 15% higher download
conversion
DOMContentLoaded
Parsing of the document is finished, the Document Object Model is ready, but referenced style sheets, images, and subframes may not be finished loading.
navigationStart
unloadEventStart
unloadEventEnd
redirectStart
redirectEnd
fetchStart
domainLookupStart
domainLookupEnd
connectStart
connectEnd
secureConnectionStart
requestStart
responseStart
responseEnd
domLoading
domInteractive
domComplete
loadEventStart
loadEventEnd
domContentLoadedEventStart
domContentLoadedEventEndAFT TimeToFirst X
Do you know your business success metrics?
LoB
Marketing
Dev
Ops
load time
4.3sBounce Rate
38%
load time
# of
pag
e vi
ews
Bounce Rate
load time
# of
pag
e vi
ews
Bounce Rate
“An artist's job is to show people what was always there but they never noticed.”
-Andrew Hamilton