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hoje vamos falar de
performance
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“Otimize a performance do
front-end primeiro, é onde
80/90% do tempo de resposta
ao usuário é gasto.”
- Steve Souders
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http://googlewebmastercentral.blogspot.com.br/2010/04/using-site-speed-in-web-search-ranking.html
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• Economizar 1kb significa:
• Em 60 segundos = 3.4GB
Fonte: http://jaydson.org/talks/x-web-performance/
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• Economizar 1kb significa:
• Em 1 hora = 180GB
Fonte: http://jaydson.org/talks/x-web-performance/
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• Economizar 1kb significa:
• Em 1 dia = 4.2TB
Fonte: http://jaydson.org/talks/x-web-performance/
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• + 15.000.000 de acessos por dia
• De 3mb para 267kb
• De 7.5s para 4.3s
Fonte: http://www.slideshare.net/keppelen/performance-frontend-front-in-macei/
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• Diminuir 3.2s resultou em:
• Redução de custo em servidores de
R$ 16.000,00 por dia
Fonte: http://www.slideshare.net/keppelen/performance-frontend-front-in-macei/
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• Diminuir 3.2s resultou em:
• Aumento de receita de
R$ 1.000.000,00 por dia
Fonte: http://www.slideshare.net/keppelen/performance-frontend-front-in-macei/
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html
CSS
imagens
servidor
jquery
JS
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html
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#27
evite
códigos
inline
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inline
#27
.center {
width: 960px;
margin: 0 auto;
}
- requisições
+tamanho
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externo
#27
+ organização
- tamanho
+ cache
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#26
estilos no topo,
scripts no rodapé
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#26
Browser Diet
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#26
Lorem ipsum dolor sit amet.
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comprima
seu html
#25
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https://code.google.com/p/htmlcompressor/
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https://github.com/jney/grunt-htmlcompressor
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#24
experimente
async & defer
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#24
script normal
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#24
script async
+ie10
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#24
script defer
+ie5
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CSS
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comprima
seu css
#23
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normal
#23
.center {
width: 960px;
margin: 0 auto;
}
/* --- Structure --- */
.intro { margin: 100px; }
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#23
comprimido
.center{width:960px;margin:0
auto;}.intro{margin:
100px;position:relative;}
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http://yui.github.com/yuicompressor/
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http://www.cssminifier.com/
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https://github.com/jzaefferer/grunt-css
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combine vários
arquivos
em um só
#22
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#22
vs
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http://yui.github.com/yuicompressor/
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http://www.cssminifier.com/
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https://github.com/jzaefferer/grunt-css
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não use
seletor
universal
#21
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* {
margin: 0;
padding: 0;
border: none;
text-decoration: none;
outline: 0;
}
#21
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http://meyerweb.com/eric/tools/css/reset/
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http://necolas.github.com/normalize.css/
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prefira
ao
@import
#20
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#20
vs
@import url('style.css');
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pense e
repense seu
key selector
#19
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key selector >> a
header nav ul li a {}
#19
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key selector
header nav ul li * { /* Péssimo */ }
header nav ul li a { /* Muito Ruim */ }
nav a { /* Ruim */ }
nav a.nav-link { /* Bom */ }
nav .nav-link { /* Ótimo */ }
.nav-link { /* Excelente */ }
#19
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JAVASCRIPT
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códigos de
terceiros?
sempre
assíncronos
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async
var script = document.createElement('script'),
scripts =
document.getElementsByTagName('script')[0];
script.async = true;
script.src = url;
scripts.parentNode.insertBefore(script,
#18
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guarde o
tamanho
do array
#17
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ruim...
var arr = new Array(1000);
for (var i = 0; i < arr.length; i++) {
// O tamanho do array é calculado 1000
}
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bom!
var arr = new Array(1000);
for (var i = 0, len = arr.length; i < len; i++) {
// O tamanho só é calculado 1 vez e armazenado
}
#17
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http://jsperf.com/browser-diet-cache-array-length
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http://jsperf.com/browser-diet-cache-array-length
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evite o
document.write
#16
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html5 boilerplate
window.jQuery || document.write('<script
src="js/vendor/jquery-1.9.0.min.js"><\/
script>')
#16
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minimize
repaints
e reflows
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ruim...
var myList = document.getElementById("myList");
for (var i = 0; i < 100; i++) {
myList.innerHTML += "" + i + "";
}
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var myList = "";
for (var i = 0; i < 100; i++) {
myList += "" + i + "";
}
document.getElementById("myList").innerHTML =
myList;
bom!
#15
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http://jsperf.com/browser-diet-dom-manipulation
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http://jsperf.com/browser-diet-dom-manipulation
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comprima
seu js
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normal
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BrowserDiet.app = function() {
var foo = true;
return {
bar: function() {
// do something
}
};
};
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comprimido
BrowserDiet.app=function()
{return{bar:function(){}}};
#14
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http://yui.github.com/yuicompressor/
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https://developers.google.com/closure/compiler/?hl=pt
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https://github.com/mishoo/UglifyJS
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combine vários
arquivos
em um só
#13
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#13
vs
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http://gruntjs.com/
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jquery
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use sempre
a última
versão
#12
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#12
vs
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seletores
#11
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#11
find
children
.class
#id
context
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#11
$("#foo");
id é mais rapido
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http://jsperf.com/browser-diet-jquery-selectors
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http://jsperf.com/browser-diet-jquery-selectors
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abuse do
encadeamento
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não encadeando
$("#object").addClass("foo");
$("#object").css("border-color","#f0f");
$("#object").width(200);
$("#object").removeClass("bar");
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encadeando
$("#object").addClass("foo").css("border-color",
"#ccc").width(200).addClass("bar");
#10
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http://jsperf.com/browser-diet-chaining
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http://jsperf.com/browser-diet-chaining
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use for
ao invés
de each
#9
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#9
while reverso
for
$.each
for in
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#9
for ( var i = 0, len = a.length; i < len; i++ ) {
e = a[i];
}
for é mais rapido
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http://jsperf.com/browser-diet-jquery-each-vs-for-loop
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http://jsperf.com/browser-diet-jquery-each-vs-for-loop
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não use
jquery
#8
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jquery
$('a').on('click', function() {
console.log( $(this).attr('id') );
});
#8
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js puro
$('a').on('click', function() {
console.log( this.id );
});
#8
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http://jsperf.com/browser-diet-this-attr-id-vs-this-id
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http://jsperf.com/browser-diet-this-attr-id-vs-this-id
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imagens
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css sprites
#7
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imagem #7
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css
#7
.icon-foo {
background-image: url('mySprite.png');
background-position: -10px -10px;
}
.icon-bar {
background-image: url('mySprite.png');
background-position: -5px -5px;
}
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http://wearekiss.com/spritepad
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http://www.spritecow.com/
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http://compass-style.org/help/tutorials/spriting/
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não escale
as imagens
direto no
código #6
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html
#6
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otimize as
imagens
#5
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#5
lossless
png 8
png 24
jpg
gif
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servidor
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habilite o
caches dos
arquivos
#4
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.htaccess
#4
ExpiresActive On
ExpiresByType image/gif "access plus 6 months"
ExpiresByType image/jpeg "access plus 6 months"
ExpiresByType image/png "access plus 6 months"
ExpiresByType text/css "access plus 6 months"
ExpiresByType text/javascript "access plus 6 months"
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gzip
#3
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.htaccess
#3
AddOutputFilterByType DEFLATE text/html
AddOutputFilterByType DEFLATE text/plain
AddOutputFilterByType DEFLATE text/xml
AddOutputFilterByType DEFLATE text/css
AddOutputFilterByType DEFLATE application/javascript
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bonus
^
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ferramentas
de análise
#2
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http://yslow.org/
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https://developers.google.com/speed/pagespeed/insights_extensions?hl=pt-BR
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http://www.webpagetest.org/
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performance deve ser
pensada no projeto
como um todo
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e não só deixar pra
testar no finalzinho
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lembre-se
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o preguiçoso
trabalha dobrado
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quero aprender mais,
aonde eu vou?
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https://developers.google.com/speed/docs/best-practices/rules_intro
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http://developer.yahoo.com/performance/rules.html
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nada em
português?
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e se a gente
juntasse...
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renato mangini
- google
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sérgio lopes
- caelum
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mike taylor
- opera
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marcel duran
- twitter
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“Pica voando das galáxias
criado em cativeiro”
browserdiet.com/pt
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“Pica voando das galáxias
criado em cativeiro”
- Bernard de Luna
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“Pica voando das galáxias
criado em cativeiro”
- Bernard de Luna
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2º Encontro - 2011
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fim.
zenorocha.com
browserdiet.com
#1