[qcon 2011] por uma web mais rápida: técnicas de otimização de sites
Post on 15-Jan-2015
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por uma web mais rápida:técnicas deotimização
de sites
Sérgio Lopes
facebook.com/sergio.caelum
@sergio_caelum
sergio.lopes@caelum.com.br
Por que você deve otimizar
seu Site?
esperar
é
muito
muito
irritante!
esperar
é
muito
muito
irritante!
Para cada 400ms de melhora,
o tráfego do Yahoo! aumenta 9%
Ao diminuir 2.2s de sua landing page, a Mozilla aumentou em 15% os downloads do Firefox.
100ms de melhora aumentam o faturamento da Amazon em 1%
de 0.4s para 0.9s. O tráfego caiu 20%.
Um experimento do Google aumentou o número de resultados de 10 para 30, indo
2s a mais na busca do Bing diminuíram o faturamento em 4.3%
Carregamento: de 2s para 6s
Requests: de 12 para 42Tamanho: de 100kb para 300kb
queda de 21% no time on site, 28% nos pageviews e
18% no conversion rate
média de
9s para carregar a página
75% demoram 400ms ou menos no servidor
Diminua o tamanho
dos requests
”“
Habilite GZIP#1
43% dos requests
sem GZIP
Minifique JavaScript#2
só13% comprimiram
todos os JavaScripts
Minifique CSS#3
Comprima HTML#4
Não redimensione imagens no HTML#5
Otimize as imagens#6
22% economizariam
mais de 40%
Pense no formato das imagens#7
PNG
JPG
GIF
PNG
JPG
GIF
Alpha
PNG
JPG
GIF
Lossy
Alpha
PNG
JPG
GIF
Lossy
Animações
Alpha
PNG
JPG
GIF
Lossy
Animações
AlphaPNG8
PNG32
Diminua cookies e headers#8
Diminua a quantidadede requests
”“
Junte arquivos JavaScript#9
média de 10 arquivos
JavaScript
Junte arquivos CSS#10
média de 5 arquivos CSS
Use Sprites#11
metade tem
mais de 36 imagens
Use Data URIs#12
<img width="160" height="50" alt="Logo Caelum" src="logo_caelum.png" />
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Configure os headers#13
87% fazem mais que 10 requests no 2º pageview
Tire firulas do design#14
Performance émedida pela
percepção do usuário
”“
Especifique o tamanho das imagens#15
Coloque o JavaScript no fim#16
média até mostrar
alguma coisa é
4.3s
Coloque o CSS no topo#17
Adie o carregamento do que puder#18
Abuse do carregamento assíncrono#19
<script type="text/javascript"> var _gaq = _gaq || []; _gaq.push(['_setAccount', 'UA-123456']); _gaq.push(['_trackPageview']);
(function() { var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; ga.src = ('https:' == document.location.protocol ? 'https://ssl':'http://www') + '.google-analytics.com/ga.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); })();</script>
Otimize o First-View#20
Design performático#21
BÔNUS!!!
Automatize#22
Use ferramentas de diagnóstico#23
Pré-carregue componentes#24
Escreva código eficiente#25
Dispare logo o onload#26
Diminua o tamanho
dos requests
Diminua o tamanho
dos requests
S
Diminua a quantidadede requests
Diminua o tamanho
dos requests
S
Diminua a quantidadede requests
Priorize carregamento e renderização
Performance émedida pela
percepção do usuário
Diminua o tamanho
dos requests
S
Diminua a quantidadede requests
S
Priorize carregamento e renderização
Fácil e rápido, faça já!#1
Importante, mas não trivial#2
Desafiador e eficaz#3
Obrigado!
facebook.com/sergio.caelum
@sergio_caelum
sergio.lopes@caelum.com.br
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