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Eva Ferreira
July 29, 2020
Programming
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De 45 a 85
Charla de web performance para Women Who Code - Buenos Aires
Eva Ferreira
July 29, 2020
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Transcript
De 45 a 85 Performance en el Front-end
¡Hola! Soy Eva • Front-end developer • Aunque a veces
hago back-end • Organizadora CSSConf Argentina • Google Developer Expert • Mozilla Tech Speaker • Hice una capa de invisibilidad con JS • https://youtu.be/pAgDRCQLwQs
Performance “Que tu sitio carga rápido”
Performance • Conexión a Internet • Tipo de dispositivo
Auditando performance Firefox o Chrome
Análisis avanzado WebPageTest.org
¿Por qué 45 a 85?
https://hitrecord.org/records/1682099
None
✨ 5 recomendaciones ✨
1. Fuentes
Usar font-display: swap;
@font-face { font-family: Test; src: url(fuente.woff) format('woff'); font-display: swap; }
h1 { font-family: Test, sans-serif; }
Grupos de fuentes • Serif • Sans-Serif • Monospace •
Cursive
Cursive Comic Sans es la alternativa para los tipos de
fuente “Cursive”
Google fonts
None
Solo traer unas pocas letras https://fonts.googleapis.com/css2?family=Comfortaa&text=Hello https://developers.google.com/fonts/docs/css2#optimizing_for_latency_and_file_size
None
2. Imágenes responsive
None
None
Imágenes • Como fondo, desde CSS • En HTML, con
la etiqueta <img>
CSS, como imagen de fondo • Usar media queries con
distintas imágenes • Distintos recortes • Distintos tamaños • … Menor peso para mobile
HTML, con la etiqueta <img> • Usar la etiqueta <picture>
<picture> <source srcset="imagen-peque.png" media="(max-width: 800px)"> <img src="imagen-grande.png" alt="Texto alternativo"> </picture>
None
None
3. Realmente achicar las imágenes
None
https://tinypng.com/
Webp https://developers.google.com/speed/webp
https://siipo.la/blog/is-webp-really-better-than-jpeg
Usando webp con <picture> <picture> <source srcset="logo.webp" type="image/webp"> <img src="logo.png"
alt="logo"> </picture>
None
4. Mejor que performance, es aparentar performance
None
None
None
None
None
None
None
None
None
♥Firefox ♥ Color picker
None
Mención especial
Lazy loading https://www.smashingmagazine.com/2018/01/deferring-lazy-loading- intersection-observer-api/
https://css-tricks.com/native-lazy-loading/
None
5. Mantener una buena performance
https://motherfuckingwebsite.com/
Medir performance a través del tiempo https://web.dev/measure
None
Mejoras (o no) a través del tiempo
None
Performace en front-end 1. Fuentes con display: swap; 2. Distintas
sources por cada dispositivo 3. Pasar tus imágenes por el panda 4. “Sensación” de performante 5. Intentar no perder lo logrado
¡Gracias!