Speed up! Critical css to the rescue
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Speed up!TO THE RESCUE
CRITICAL CSS
TO THE RESCUE
CRITICAL CSS
Speed up!
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Oi!Oi!
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Oi!Oi!Sou Ami ReynosoSou Ami Reynoso
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Sou Ami ReynosoSou Ami ReynosoEngenheira frontendno Mercado LivreEngenheira frontend no Mercado Livre
Oi!Oi!
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- A Front End Engineer’s Manifesto
EM PRIMEIRO LUGAREM PRIMEIRO LUGARUSUÁRIOUSUÁRIO
sobre as minhas próprias necessidades como desenvolvedor.
Mais importante ainda, e acima de tudo,vou colocar as necessidades do
- A Front End Engineer’s Manifesto
Mais importante ainda, e acima de tudo,vou colocar as necessidades do
sobre as minhas próprias necessidades como desenvolvedor.
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usuários felizes
usuários felizes
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usuários felizes
usuários felizes
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WEBSITE RÁPIDO
usuários felizes
usuários felizesWEBSITE RÁPIDO
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WEBSITE RÁPIDO ?
WEBSITE RÁPIDO ?
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WEBSITE RÁPIDO ?
WEBSITE RÁPIDO ?
carrega literalmente rápido carrega literalmente rápido
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carrega literalmente rápidousuário percebe
que carrega rápido
carrega literalmente rápidousuário percebe
que carrega rápido
WEBSITE RÁPIDO ?
WEBSITE RÁPIDO ?
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percepçao
percepção
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1993 · Jakob Nielsen
1993 · Jakob Nielsen
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LIMITES NA PERCEPÇAO
1993 · Jakob Nielsen
1993 · Jakob NielsenLIMITES NA
PERCEPÇÃO
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0.1 segundos0.1 segundos
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0.1 segundos1 segundo
0.1 segundos1 segundo
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0.1 segundos1 segundo
10 segundos10 segundos1 segundo
0.1 segundos
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Rendering pathRendering path
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WTF?Rendering pathRendering path
WTF?
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Do que estamos falando?
Do que estamos falando?
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clique aqui!
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clique aqui!
digite a URL
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clique aqui!
digite a URL
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clique aqui!
digite a URL
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clique aqui!
digite a URL eventos
eventos
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O que é realmente?
O que é realmente?
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1 NETWORK REQUESTNETWORK REQUEST
1~ 600 milliseconds~ 600 milissegundos
2 RESPOSTA DO SERVIDOR
2 RESPOSTA DO SERVIDOR
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PROCESSAMENTO DE HTML & CONSTRUÇÃO DE DOM
33 PROCESSAMENTO DE HTML & CONSTRUÇÃO DE DOM
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PROCESSAMENTO DE CSS & CONSTRUÇÃO DE CSSOM
44 PROCESSAMENTO DE CSS & CONSTRUÇÃO DE CSSOM
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5 RENDER TREERENDER TREE5
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6 LAYOUTLAYOUT6
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7 PINTADO7 PINTADO
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Como podemos otimizar isso?
Como podemos otimizar isso?
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➔ Embale seus recursos!➔ Utilize resource hints➔ Não bloqueie o caminho de
renderização!➔ Minify e gzip
➔ Embale seus recursos!
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➔ Embale seus recursos!➔ Utilize resource hints➔ Não bloqueie o caminho de
renderização!➔ Minify e gzip
➔ Embale seus recursos!➔ Utilize resource hints
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➔ Embale seus recursos!➔ Utilize resource hints➔ Não bloqueie o caminho de
renderização!➔ Minify e gzip
➔ Embale seus recursos!➔ Utilize resource hints➔ Não bloqueie o caminho de
renderização!
![Page 37: Speed up! Critical css to the rescue](https://reader037.fdocuments.net/reader037/viewer/2022103010/5872ed161a28abfa548b76ed/html5/thumbnails/37.jpg)
➔ Embale seus recursos!➔ Utilize resource hints➔ Não bloqueie o caminho de
renderização!➔ Minify e gzip
➔ Embale seus recursos!➔ Utilize resource hints➔ Não bloqueie o caminho de
renderização!➔ Minify e gzip
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✔ Critical Rendering Path✔ Critical Rendering Path
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✔ Critical Rendering Path✔ Como otimizá-lo✔ Critical Rendering Path✔ Como otimizá-lo
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✔ Critical Rendering Path✔ Como otimizá-lo CSS?
✔ Critical Rendering Path✔ Como otimizá-lo CSS?
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Percepção do usuário
✔ Critical Rendering Path✔ Como otimizá-lo CSS?
✔ Critical Rendering Path✔ Como otimizá-lo CSS? Percepção do usuário
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para o resgate!
para o resgate!
Critical CSSCritical CSS
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O que é Critical CSS?
O que é Critical CSS?
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O que é Critical CSS?
O que é Critical CSS?
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necessáriopara nosso above the
fold
necessáriopara nosso above the
fold
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.my-awesome-header { background-color: #eee; font-size: 1.5em; color: #111;}.my-awesome-container { max-width: 90%; font-size: 1.2em; color: #333;}.my-awesome-title { font-size: 1.3em; font-weight: bold;}
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<head><head>
.my-awesome-header { background-color: #eee; font-size: 1.5em; color: #111;}.my-awesome-container { max-width: 90%; font-size: 1.2em; color: #333;}.my-awesome-title { font-size: 1.3em; font-weight: bold;}
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Mas, e quanto ao resto dos meus estilos?
Mas, e quanto ao resto dos meus estilos?
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Javascript mágica!
Javascript mágica!
Mas, e quanto ao resto dos meus estilos?
Mas, e quanto ao resto dos meus estilos?
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O que vamos alcançar?
O que vamos alcançar?
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de carregamento da página
percepçãopercepçãode carregamento
da página
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O queter em mente?
O que ter em mente?
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1 DEPENDE DE JAVASCRIPT
1 DEPENDE DE JAVASCRIPT
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2 BROWSER CACHEBROWSER CACHE2
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Conservar se o usuário játem os estilosConservar se o usuário já tem os estilos
2 BROWSER CACHEBROWSER CACHE2
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Como...Como...
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Como...carregar os estilos
Como...carregar os estilos
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➔ Script de carregamento➔ Resource hint: preload➔ Verificar a existência de cookie
e salvar➔<noscript> fallback!
➔ Script de carregamento
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window.addEventListener("load", function(event) { // create element var elem = document.createElement("link"); // make it a stylesheet link elem.setAttribute("rel", "stylesheet"); elem.setAttribute("type", "text/css"); elem.setAttribute("href", "styles.css"); // append to head document.querySelector("head").appendChild(elem);});
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➔ Script de carregamento➔ Resource hint: preload➔ Verificar a existência de cookie
e salvar➔<noscript> fallback!
➔ Script de carregamento➔ Resource hint: preload
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<link rel="preload" href="path/to/full/styles.css" as="style" onload="this.rel='stylesheet'">
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➔ Script de carregamento➔ Resource hint: preload➔ Verificar a existência de cookie
e salvar➔<noscript> fallback!
➔ Script de carregamento➔ Resource hint: preload➔ Verificar a existência de cookie
e salvar
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<?php if(isset($_COOKIE["css"]) && $_COOKIE["css"] = $version): ?> <link href="styles.<?php $version; ?>.css" rel="stylesheet"><?php else : ?> <style> /* inlined Critical CSS */ </style> <script> var version = <?php $version; ?>; function cookie(key, value, expires) { … } if(!cookie("css") || cookie("css") !== version) { // load styles cookie("css", version); } </script><?php endif; ?>
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➔ Script de carregamento➔ Resource hint: preload➔ Verificar a existência de cookie
e salvar➔<noscript> fallback!
➔ Script de carregamento➔ Resource hint: preload➔ Verificar a existência de cookie
e salvar➔<noscript> fallback!
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<style> /* inline Critical CSS */ </style><noscript> <link rel="stylesheet" type="text/css"
href="styles.css"></noscript>
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Como...gerar osestilos
Como...gerar os estilos
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pré-processador + boa base de
código
ferramentas auto-mágicasferramentas auto-mágicas
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pré-processador + boa base de
código
ferramentas auto-mágicasferramentas auto-mágicas
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pré-processador + boa base de
código
ferramentas auto-mágicasferramentas auto-mágicas
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pré-processador + boa base de
código
ferramentas auto-mágicasferramentas auto-mágicas
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pré-processador + boa base de
código
ferramentas auto-mágicasferramentas auto-mágicas
pré-processador + boa base de
código
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pré-processador + boa base de
código
ferramentas auto-mágicasferramentas auto-mágicas
pré-processador + boa base de
código
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pré-processador + boa base de
código
ferramentas auto-mágicasferramentas auto-mágicas
pré-processador + boa base de
código
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pré-processador + boa base de
código
ferramentas auto-mágicasferramentas auto-mágicas
pré-processador + boa base de
código
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em Mercado Livre
em Mercado Livre
Critical CSSCritical CSS
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Onde o fizemosOnde o fizemos
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Mercado LivreMercado Livre
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Search listingsSearch listings
Mercado LivreMercado Livre
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Search listingsSearch listingsWeb mobileWeb mobile
Mercado LivreMercado Livre
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Search listingsSearch listingsWeb mobileWeb mobile
Mercado LivreMercado Livre
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Mercado LivreMercado Livre
Search listingsSearch listingsWeb mobileWeb mobile
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Mercado LivreMercado Livre
Search listingsSearch listingsWeb mobileWeb mobile
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Mercado LibreMercado Libre
Search listingsSearch listingsWeb mobileWeb mobile
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Como fizemosComo fizemos
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gerado on-linegerado on-line
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++proceso artesanal
gerado on-lineproceso artesanal
gerado on-line
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~20 bundles diferentesproceso artesanal
gerado on-line
~20 bundles diferentesproceso artesanal
gerado on-line++++
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==
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grande bagunça
grande bagunça
==
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a longo prazoa longo prazo
==grande
bagunçagrande
bagunça
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O que isto significou para nós
O que isto significou para nós
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resultados impressionantes! *
resultados impressionantes! *
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* mesmo vindo de uma má experiência!* mesmo vindo de uma má experiência!
resultados impressionantes! *
resultados impressionantes! *
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antes
depois
antes
depois
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-56%
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percepção dotempo de
carga
-56%
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+2%-56%percepção do
tempo de carga
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-56% +2%taxa de
conversãopercepção do
tempo de carga
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critical csscritical css
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otimizações de velocidade
otimizações de velocidade
++critical csscritical css
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SUCESSO!SUCESSO!=++
critical csscritical css
=otimizações de
velocidadeotimizações de
velocidade
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