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*fantastic*
frontend
performance
tricks and
why we
do them
Jenna Zeigen
QCon SF
11/5/18
whee!
InfoQ.com: News & Community Site
• Over 1,000,000 software developers, architects and CTOs read the site world-
wide every...
Purpose of QCon
- to empower software development by facilitating the spread of
knowledge and innovation
Strategy
- practi...
jenna.is/at-qconsf
@zeigenvector
Senior Frontend Engineer
at Slack
Organizer of EmpireJS
Organizer of BrooklynJS
Whatchu know 'bout FE?
Whatchu, whatchu know 'bout FE?
Whatchu know 'bout FE?
Whatchu, whatchu know?
♪♪♪
loading
+
rendering
loading
+
rendering
(keep things small)
loading
+
rendering
(keep things small)
(keep things smart)
loading
+
rendering
(keep things small)
(keep things smooth)
(keep things smart)
but wait
how do
websites?
'Cause I’m on the network
getting packets
Server’s sending me three-
hundred and five
♪♪♪
how do websites?
The bigger you send,
The harder you fall
Take it from me, girl,
You gotta start small
♪♪♪
how do websites?
We did everything right,
Bytes are on the client side
♪♪♪
how do websites?
Are you listening?
(Whoa-oh-oh-oh-oh)
Please come back.
(Whoa-oh-oh-oh-oh)
I’ll tell you what do I need
I’ll tell you what...
how do websites?
document
html
head body
divtitle
h1 p
“Kitties!” “Cats!”
how do websites?
document
html
head body
divtitle
h1 p
“Kitties!” “Cats!”
body
div
h1 p
font-size: 16px
font-size: 16px
fo...
how do websites?
+
document
html
head body
divtitle
h1 p
“Kitties!” “Cats!”
body
div
h1 p
font-size: 16px
font-size: 16px
...
The page was still young
When I first saw you
♪♪♪
Well, I'm gonna paint my picture
Paint myself in blue and red and
green and… a
All of the beautiful pixels
are very, very ...
Whoa, oh, oh, oh, oh
Whoa, oh, oh, oh,
DOM’s interactive
DOM’s interactive
♪♪♪
keep
things
small
Harder, Better,
Faster, Smaller
♪♪♪
keep things small
minify your html, css, and js
Got some files to send over
And their length’s insane
Remove the whitespace, baby
It’ll up y...
var array = [];
for (var i = 0; i < 20; i++) {
array[i] = i;
}
https://en.wikipedia.org/wiki/Minification_(programming)
ke...
for(var a=[i=0];++i<20;a[i]=i);
https://en.wikipedia.org/wiki/Minification_(programming)
keep things small
minify your htm...
compress your html, css, and js
Shrink it down,
gzip it
(Don’t reverse it…)
♪♪♪
keep things small
optimize your images
All the small things
What speed this brings!
♪♪♪
keep things small
optimize your images
The picture is far too
big to look at kid
Your screen’s just not
wide enough
♪♪♪
keep things small
optimize your images
keep things small
<img srcset="miso-320w.jpg 320w,
miso-480w.jpg 480w,
miso-800w.jpg 800w"
sizes="(ma...
optimize your images
keep things small
<picture>
<source
media="(max-width: 799px)"
srcset="miso-480w-close-portrait.jpg">...
caching
Guess they had to change that code
Updated that file
Which then changed its number
So I need the new stuff though
...
caching
Pull it down, I'm yelling timber
Unless it moves or gets enhanced
This data, I’m told to remember
Until it tells m...
only include *necessary* files
Well I know that
I'll get through this
'Cause I know that I am smart
I don't need you anymo...
only include *necessary* files
Shake it, shake it, shake it,
Shake it, shake it, shake it,
Shake it, shake it, shake it
Sh...
optimize fonts
Baby I don't need fancy glyphs
To have a good site
(Yay system fonts!)
♪♪♪
keep things small
put your assets in a cdn
keep things small
I feel so close to you right now
♪♪♪
keep
things
smart
concatenate your css and js
Come together, right now
Up the speed
♪♪♪
keep things smart
use image sprites and icon fonts
Yeah, it's always better
When they’re together
♪♪♪
keep things smart
make js non-blocking
Scripts go at the bottom
Not up here
Scripts go at the bottom
So the whole page freakin’ here
♪♪♪
kee...
make js non-blocking
So I don’t take the fall
Of a document.write call
When I see you, everything stops
Never put JS on to...
keep things smart
make js non-blocking
We can’t stop…
♪♪♪
make js non-blocking
And we won’t stop…
♪♪♪
keep things smart
make js non-blocking
But yeah does it feel so good
'Cause I get scripts when
I want them now
And if you could
then you kno...
put css at the top
In your <head>
In your <head>
Stylesheet, stylesheet,
eet, eet, eet
♪♪♪
keep things smart
put css at the top
Critical styles inlined
To make this page load streamlined
♪♪♪
keep things smart
How you gonna upgrade me?
What's higher than
One point one?
♪♪♪
keep things smart
use http/2
Want you to make me feel
Like I'm the only
TCP connection in the world
♪♪♪
keep things smart
use http/2
These are my compressions
♪♪♪
keep things smart
use http/2
Ah, push it
Push it good
Ah, push it
Push it real good
♪♪♪
keep things smart
use http/2
keep
things
smooth
keep things smooth
You got the kind of scrollin’
That can be so ~smooth~, yeah
Get rid of jank, make it real
Or else forge...
how do websites, pt 2
+
document
html
head body
divtitle
h1 p
“Kitties!” “Cats!”
body
div
h1 p
font-size: 16px
font-size: ...
how do websites, pt 2
RenderView
Scroll
Block
Block
Block
Block Block
Text Text
Cause the render’s gonna…
rend, rend, rend...
how do websites, pt 2
RenderView
Scroll
Block
Block
Block
Block Block
Text Text
And the painter’s gonna
paint, paint, pain...
how do websites, pt 2
RenderView
Scroll
Block
Block
Block
Block Block
Text Text
And the compositor’s gonna
composite, comp...
how do websites, pt 2
Do it alllll agaaaain
♪♪♪
how do websites, pt 2
Layout Painting Compositing
this. sick. feat.
♪♪♪
how do websites, pt 2
Loop loop ba-doop loop ba-doop
Loop ba-doop ba-doop
Ba-doop loop ba-doop loop
Ba-doop loop ba-doop, ...
Here’s to never ending circles
And building them on top of me
And here's to another no, man
You won’t get a render
You won...
use requestAnimationFrame
keep things smooth
Debounce bounce bounce
bounce bounce bounce
bounce bounce bounce
bounce
♪♪♪
use requestAnimationFrame
keep things smooth
use requestAnimationFrame
keep things smooth
Baby, I'm not always
There when you call,
But I'm always on time
And I gave y...
use web workers
keep things smooth
Give it away
Give it away
Give it away
Give it away now
♪♪♪
use web workers
keep things smooth
When what you have
Will take too long
Move along, move along
Like I know you do
♪♪♪
animate with transform + opacity
keep things smooth
I, I, I, I, I, I
Know how to transform
I transform, I transform
I'm a ...
animate with transform + opacity
keep things smooth
Layout Painting Compositing
animate with transform + opacity
keep things smooth
.moving-element {
will-change: transform;
}
use a css methodology
keep things smooth
CSS, take it easy
For there is something
that we can do.
CSS, take it easy
BEM it...
use a css methodology
keep things smooth
.box:nth-last-child(-n+1) .title {
  /* styles */
}
https://developers.google.com...
use a css methodology
keep things smooth
.Box_title--special {
  /* styles */
}
https://developers.google.com/web/fundamen...
always
measure
first
always measure first
synthetic measurements
Is someone getting the test,
the test, the test,
the test of you?
♪♪♪
always measure first
real user measurements
Ain’t it fun
Timing in the real world
Ain’t it good
Testing in their Chrome
♪♪♪
seriously,
always
measure
first
keep things
small, keep
things smart,
keep things
smooth
•Front-End Performance Checklist 2018
•Optimizing the Critical Rendering Path
•Rendering Performance
•Philip Roberts: What...
Lil' Mama - Lip Gloss
Alanis Morissette – Hand in My Pocket
The Supremes & The Four Tops - The Bigger You Love, The Harder...
Beyoncé - Love on Top
Miley Cyrus - We Can’t Stop
Paramore - Misery Business
The Cranberries - Zombie
Taking Back Sunday -...
Thanks!
jenna.is/at-qconsf
@zeigenvector
💙 🐳
🚀
✨
🌻🐝
⚡
😻 🔥
🌟
🍉
🍕 💖
🐢
🐘
Watch the video with slide
synchronization on InfoQ.com!
https://www.infoq.com/presentations/
front-end-performance-optimi...
Fantastic Front-End Performance Tricks & Why We Do Them
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Fantastic Front-End Performance Tricks & Why We Do Them

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Video and slides synchronized, mp3 and slide download available at URL https://bit.ly/2RpPoJm.

Jenna Zeigen covers the state of the art in front-end performance optimizations— from minimizing file size to preventing thrashing— digging into the way the internet and browsers work to explain why each of these practices is important. Filmed at qconsf.com.

Jenna Zeigen is a Senior Software Engineer at Slack.

Publié dans : Technologie
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Fantastic Front-End Performance Tricks & Why We Do Them

  1. 1. *fantastic* frontend performance tricks and why we do them Jenna Zeigen QCon SF 11/5/18 whee!
  2. 2. InfoQ.com: News & Community Site • Over 1,000,000 software developers, architects and CTOs read the site world- wide every month • 250,000 senior developers subscribe to our weekly newsletter • Published in 4 languages (English, Chinese, Japanese and Brazilian Portuguese) • Post content from our QCon conferences • 2 dedicated podcast channels: The InfoQ Podcast, with a focus on Architecture and The Engineering Culture Podcast, with a focus on building • 96 deep dives on innovative topics packed as downloadable emags and minibooks • Over 40 new content items per week Watch the video with slide synchronization on InfoQ.com! https://www.infoq.com/presentations/ front-end-performance-optimization
  3. 3. Purpose of QCon - to empower software development by facilitating the spread of knowledge and innovation Strategy - practitioner-driven conference designed for YOU: influencers of change and innovation in your teams - speakers and topics driving the evolution and innovation - connecting and catalyzing the influencers and innovators Highlights - attended by more than 12,000 delegates since 2007 - held in 9 cities worldwide Presented at QCon San Francisco www.qconsf.com
  4. 4. jenna.is/at-qconsf @zeigenvector
  5. 5. Senior Frontend Engineer at Slack Organizer of EmpireJS Organizer of BrooklynJS
  6. 6. Whatchu know 'bout FE? Whatchu, whatchu know 'bout FE? Whatchu know 'bout FE? Whatchu, whatchu know? ♪♪♪
  7. 7. loading + rendering
  8. 8. loading + rendering (keep things small)
  9. 9. loading + rendering (keep things small) (keep things smart)
  10. 10. loading + rendering (keep things small) (keep things smooth) (keep things smart)
  11. 11. but wait how do websites?
  12. 12. 'Cause I’m on the network getting packets Server’s sending me three- hundred and five ♪♪♪ how do websites?
  13. 13. The bigger you send, The harder you fall Take it from me, girl, You gotta start small ♪♪♪ how do websites?
  14. 14. We did everything right, Bytes are on the client side ♪♪♪ how do websites?
  15. 15. Are you listening? (Whoa-oh-oh-oh-oh) Please come back. (Whoa-oh-oh-oh-oh) I’ll tell you what do I need I’ll tell you what do I need Whoa-oh, whoa-oh ♪♪♪ how do websites?
  16. 16. how do websites? document html head body divtitle h1 p “Kitties!” “Cats!”
  17. 17. how do websites? document html head body divtitle h1 p “Kitties!” “Cats!” body div h1 p font-size: 16px font-size: 16px font-weight: bold font-size: 16px color: blue font-size: 16px float: left
  18. 18. how do websites? + document html head body divtitle h1 p “Kitties!” “Cats!” body div h1 p font-size: 16px font-size: 16px font-weight: bold font-size: 16px color: blue font-size: 16px float: left = RenderView Scroll Block Block Block Block Block Text Text
  19. 19. The page was still young When I first saw you ♪♪♪
  20. 20. Well, I'm gonna paint my picture Paint myself in blue and red and green and… a All of the beautiful pixels are very, very meaningful ♪♪♪
  21. 21. Whoa, oh, oh, oh, oh Whoa, oh, oh, oh, DOM’s interactive DOM’s interactive ♪♪♪
  22. 22. keep things small
  23. 23. Harder, Better, Faster, Smaller ♪♪♪ keep things small
  24. 24. minify your html, css, and js Got some files to send over And their length’s insane Remove the whitespace, baby It’ll up your game ♪♪♪ keep things small
  25. 25. var array = []; for (var i = 0; i < 20; i++) { array[i] = i; } https://en.wikipedia.org/wiki/Minification_(programming) keep things small minify your html, css, and js
  26. 26. for(var a=[i=0];++i<20;a[i]=i); https://en.wikipedia.org/wiki/Minification_(programming) keep things small minify your html, css, and js
  27. 27. compress your html, css, and js Shrink it down, gzip it (Don’t reverse it…) ♪♪♪ keep things small
  28. 28. optimize your images All the small things What speed this brings! ♪♪♪ keep things small
  29. 29. optimize your images The picture is far too big to look at kid Your screen’s just not wide enough ♪♪♪ keep things small
  30. 30. optimize your images keep things small <img srcset="miso-320w.jpg 320w, miso-480w.jpg 480w, miso-800w.jpg 800w" sizes="(max-width: 320px) 280px, (max-width: 480px) 440px, 800px" src="miso-800w.jpg" alt="Miso, a big, red cat">
  31. 31. optimize your images keep things small <picture> <source media="(max-width: 799px)" srcset="miso-480w-close-portrait.jpg"> <source media="(min-width: 800px)" srcset="miso-800w.jpg"> <img src="miso-800w.jpg" alt="Miso, a big red cat"> </picture>
  32. 32. caching Guess they had to change that code Updated that file Which then changed its number So I need the new stuff though Now it’s just some page That I used to know ♪♪♪ keep things small
  33. 33. caching Pull it down, I'm yelling timber Unless it moves or gets enhanced This data, I’m told to remember Until it tells me to forget ♪♪♪ keep things small
  34. 34. only include *necessary* files Well I know that I'll get through this 'Cause I know that I am smart I don't need you anymore I don't need you anymore I don't need you anymore No I don't need you anymore… ♪♪♪ keep things small
  35. 35. only include *necessary* files Shake it, shake it, shake it, Shake it, shake it, shake it, Shake it, shake it, shake it Shake it like a JavaScript bundle Hey ya! ♪♪♪ keep things small
  36. 36. optimize fonts Baby I don't need fancy glyphs To have a good site (Yay system fonts!) ♪♪♪ keep things small
  37. 37. put your assets in a cdn keep things small I feel so close to you right now ♪♪♪
  38. 38. keep things smart
  39. 39. concatenate your css and js Come together, right now Up the speed ♪♪♪ keep things smart
  40. 40. use image sprites and icon fonts Yeah, it's always better When they’re together ♪♪♪ keep things smart
  41. 41. make js non-blocking Scripts go at the bottom Not up here Scripts go at the bottom So the whole page freakin’ here ♪♪♪ keep things smart
  42. 42. make js non-blocking So I don’t take the fall Of a document.write call When I see you, everything stops Never put JS on top ♪♪♪ keep things smart
  43. 43. keep things smart make js non-blocking We can’t stop… ♪♪♪
  44. 44. make js non-blocking And we won’t stop… ♪♪♪ keep things smart
  45. 45. make js non-blocking But yeah does it feel so good 'Cause I get scripts when I want them now And if you could then you know you would 'Cause yeah it just feels so It just feels so good ♪♪♪ keep things smart
  46. 46. put css at the top In your <head> In your <head> Stylesheet, stylesheet, eet, eet, eet ♪♪♪ keep things smart
  47. 47. put css at the top Critical styles inlined To make this page load streamlined ♪♪♪ keep things smart
  48. 48. How you gonna upgrade me? What's higher than One point one? ♪♪♪ keep things smart use http/2
  49. 49. Want you to make me feel Like I'm the only TCP connection in the world ♪♪♪ keep things smart use http/2
  50. 50. These are my compressions ♪♪♪ keep things smart use http/2
  51. 51. Ah, push it Push it good Ah, push it Push it real good ♪♪♪ keep things smart use http/2
  52. 52. keep things smooth
  53. 53. keep things smooth You got the kind of scrollin’ That can be so ~smooth~, yeah Get rid of jank, make it real Or else forget about it ♪♪♪
  54. 54. how do websites, pt 2 + document html head body divtitle h1 p “Kitties!” “Cats!” body div h1 p font-size: 16px font-size: 16px font-weight: bold font-size: 16px color: blue font-size: 16px float: left = RenderView Scroll Block Block Block Block Block Text Text
  55. 55. how do websites, pt 2 RenderView Scroll Block Block Block Block Block Text Text Cause the render’s gonna… rend, rend, rend? ♪♪♪
  56. 56. how do websites, pt 2 RenderView Scroll Block Block Block Block Block Text Text And the painter’s gonna paint, paint, paint… ♪♪♪
  57. 57. how do websites, pt 2 RenderView Scroll Block Block Block Block Block Text Text And the compositor’s gonna composite, composite, composite… ♪♪♪
  58. 58. how do websites, pt 2 Do it alllll agaaaain ♪♪♪
  59. 59. how do websites, pt 2 Layout Painting Compositing this. sick. feat. ♪♪♪
  60. 60. how do websites, pt 2 Loop loop ba-doop loop ba-doop Loop ba-doop ba-doop Ba-doop loop ba-doop loop Ba-doop loop ba-doop, ba-doop, ba-doop ♪♪♪
  61. 61. Here’s to never ending circles And building them on top of me And here's to another no, man You won’t get a render You won’t get a render ♪♪♪ how do websites, pt 2
  62. 62. use requestAnimationFrame keep things smooth Debounce bounce bounce bounce bounce bounce bounce bounce bounce bounce ♪♪♪
  63. 63. use requestAnimationFrame keep things smooth
  64. 64. use requestAnimationFrame keep things smooth Baby, I'm not always There when you call, But I'm always on time And I gave you my all, Now baby, be mine ♪♪♪
  65. 65. use web workers keep things smooth Give it away Give it away Give it away Give it away now ♪♪♪
  66. 66. use web workers keep things smooth When what you have Will take too long Move along, move along Like I know you do ♪♪♪
  67. 67. animate with transform + opacity keep things smooth I, I, I, I, I, I Know how to transform I transform, I transform I'm a transformer I, I, I, I, I, I Know how to transform I transform (I can do it!) I'll transform (I can do it!) I'm a transformer ♪♪♪
  68. 68. animate with transform + opacity keep things smooth Layout Painting Compositing
  69. 69. animate with transform + opacity keep things smooth .moving-element { will-change: transform; }
  70. 70. use a css methodology keep things smooth CSS, take it easy For there is something that we can do. CSS, take it easy BEM it on me Or BEM it on you. ♪♪♪
  71. 71. use a css methodology keep things smooth .box:nth-last-child(-n+1) .title {   /* styles */ } https://developers.google.com/web/fundamentals/performance/rendering/ reduce-the-scope-and-complexity-of-style-calculations
  72. 72. use a css methodology keep things smooth .Box_title--special {   /* styles */ } https://developers.google.com/web/fundamentals/performance/rendering/ reduce-the-scope-and-complexity-of-style-calculations
  73. 73. always measure first
  74. 74. always measure first synthetic measurements Is someone getting the test, the test, the test, the test of you? ♪♪♪
  75. 75. always measure first real user measurements Ain’t it fun Timing in the real world Ain’t it good Testing in their Chrome ♪♪♪
  76. 76. seriously, always measure first
  77. 77. keep things small, keep things smart, keep things smooth
  78. 78. •Front-End Performance Checklist 2018 •Optimizing the Critical Rendering Path •Rendering Performance •Philip Roberts: What the heck is the event loop anyway? •window.requestAnimationFrame() •Using Web Workers •Assessing Loading Performance in Real Life with Navigation and Resource Timing •High Performance Browser Networking •Server Farm to Table, Annotated Resources
  79. 79. Lil' Mama - Lip Gloss Alanis Morissette – Hand in My Pocket The Supremes & The Four Tops - The Bigger You Love, The Harder You Fall Calvin Harris ft. Ellie Goulding - Outside Jimmy Eat World - Sweetness Taylor Swift - Love Story Counting Crows - Mr. Jones Imagine Dragons - Radioactive Daft Punk – Harder, Better, Faster, Stronger Taylor Swift - Blank Space Missy Elliot - Work It Blink 182 - All The Small Things Bright Eyes - The Big Picture Gotye - Somebody That I Used To Know Pitbull ft. Ke$ha - Timber Cher - Believe OutKast - Hey Ya Sia - Cheap Thrills Calvin Harris - Feel So Close The Beatles - Come Together Jack Johnson - Better Together Drake - Started from the Bottom Complete Tracklist
  80. 80. Beyoncé - Love on Top Miley Cyrus - We Can’t Stop Paramore - Misery Business The Cranberries - Zombie Taking Back Sunday - Cute Without the E Beyoncé - Upgrade U Rihanna - Only Girl in the World Usher - Confessions Part II Salt-N-Pepa - Push It Santana ft. Rob Thomas - Smooth Taylor Swift - Shake it Off Katy Perry - Last Friday Night (T.G.I.F) Salt-N-Pepa - Shoop CHVRCHES - Never Ending Circles R. Kelly - Ignition Ja Rule ft. Ashanti - On Time Red Hot Chili Peppers - Give it Away The All-American Rejects - Move Along Gnarls Barkley - Transformer Mika - Relax, Take it Easy Foo Fighters - The Best of You Paramore - Ain't it Fun Complete Tracklist *something witty about a POP server…*
  81. 81. Thanks! jenna.is/at-qconsf @zeigenvector 💙 🐳 🚀 ✨ 🌻🐝 ⚡ 😻 🔥 🌟 🍉 🍕 💖 🐢 🐘
  82. 82. Watch the video with slide synchronization on InfoQ.com! https://www.infoq.com/presentations/ front-end-performance-optimization

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