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Performances web - quoi de neuf ?

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Qu'est ce qui a changé ces dernières années pour la performance Web ?
Quelles sont les pratiques obsolètes, limite ou toujours au top ?
Tour d'horizon en 20 minutes de la perf aujourd'hui

Publié dans : Technologie
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Performances web - quoi de neuf ?

  1. 1. Quoi de neuf dans la Performance Web ? Ce qui marche Ce qui ne marche pas Ce qui marchouille…
  2. 2. Bonjour je suis • Jean-pierre VINCENT • Dans le Web depuis 2000 • Dans la perf depuis 2005 • Startups, Yahoo!, grosses boites FR … • Indépendant : expert JS et perfs • Formateur, prof, auteur • Viens jouer : @theystolemynick braincracking.org
  3. 3. LE CHAMP DE BATAILLE À quoi ça ressemble le front papa ?
  4. 4. Le monde est devenu merveilleux Depuis 2005 : • La fibre, la 4G ! • Des navigateurs qui boostent ! • HTML5 • De nouveaux protocoles !
  5. 5. Le monde est devenu merveilleux • Explosion du CSS3 • Flat Design • Sites dédiés mobiles
  6. 6. Ce qui n’a pas changé • L’être humain – Need For Speed • La vitesse de la lumière – Fibre : débit X 10 mais chargement - 20% … • La transmission radio – Mobile = latence = pas si rapide
  7. 7. Ce qui n’a pas changé • L’ADSL • IE 8 (ou pire malheureux)
  8. 8. Ce qui a empiré • Les attentes des utilisateurs : – Si mon petit téléphone est fluide, pourquoi pas ton site sur mon gros PC ? • Google lit le JS – Ce qui veut dire que la perf front va influencer le taux de crawl
  9. 9. Ce qui a empiré • Ton département marketing : – Tags – Publicités – Widgets – AB Testing en MASSE
  10. 10. Ce qui a empiré • Le poids des sites – +130% de poids en 3 ans ! – +56% sur les dédiés mobile ! • Les nouvelles fonctionnalités – Font, grosses images, HTTPS • Le RWD – Retina© + IE6 + 5 breakpoints
  11. 11. L’ARSENAL
  12. 12. Ce qui ne marche plus Oublies : • Le domain sharding • JS en bas de page
  13. 13. Ce qui marchera (ou pas) • SPDY / HTTP2 – 30% de gain selon les organisateurs … – 0% selon la police • Images responsives, specs : – ”srcset”, “src-N“, <picture>, client- hints … – ou pas • CSS “will-change“ • Format d’image WebP
  14. 14. Les nouveaux trucs qui marchent • Fonts asynchrones • DOM Storage, offline • Exécution non bloquante de JavaScript – Web Workers, RaF – setTimeout (fn, 0)
  15. 15. Ce qui marchouille • domaine des statiques séparé – des fois oui – des fois non • JS Asynchrone • CDN
  16. 16. Ce qui marchouille • Contenu dans le HTML : – CSS, JS, images => google.fr • CSS3 – Moins d’images – Ça peut ramer • JPG progressif – Partout sauf IE8 / iOS
  17. 17. CE QUI MARCHERA TOUJOURS
  18. 18. Ce qui marchera toujours • Configure ton serveur bon sang : – Keep-alive – Gzip (lvl 9) – Minifie (Et offre toi de quoi surveiller tes admins)
  19. 19. Ce qui marchera toujours • Gère ton cache ! – Savoir le créer – Savoir l’invalider • Le super cache : l’offline
  20. 20. Ce qui marchera toujours • Asynchrone sur : – Pubs – Widgets – Trackers – Images non-visibles • Grouper : – JS et CSS en 2 X 2 fichiers – Sprites, fonts iconiques
  21. 21. La morale de cette histoire • Fais ta veille • Teste (en Dev) • Re-teste (en Prod) • Surveille (Et appelle moi, j’ai un paquet d’idées rentables) (au pire je te forme)
  22. 22. Questions ?
  23. 23. Jean-pierre VINCENT • Consultant indépendant – Applications Web (HTML5 / JS) – Performances ! • Formateur – JavaScript – Performances • Veilleur : @theystolemynick braincracking.org
  24. 24. J’ai quasi-volé ces photos à : • Blurb Code • Marcela Palma • AlsaCréationS • Alex Proimos • JD Hancock • Ant Baena • Kit • Honza Soukup • Nicu Buculei • Earl

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