Predictive Prefetching

Transcript

1. twitter.com/mgechev Predictive Prefetching twitter.com/mgechev github.com/mgechev blog.mgechev.com
2. twitter.com/mgechev twitter.com/mgechev github.com/mgechev
3. twitter.com/mgechev Evolution of the web UI Code-splitting Prefetching Guess.js Agenda
4. twitter.com/mgechev
5. twitter.com/mgechev
6. twitter.com/mgechev
7. twitter.com/mgechev https://medium.com/dev-channel/the-cost-of-javascript-84009f51e99e
8. twitter.com/mgechev lazy-loading
9. twitter.com/mgechev - Route-based - Component-based Lazy-loading strategies
10. twitter.com/mgechev Step 1: Open https://example.com/ Step 2: Determine JavaScript which is likely to be required Step 3: Download the chunks Step 4: Store chunks in browser cache Pre-fetching
11. twitter.com/mgechev How do we pick the priorities of the bundles to pre-fetch?
12. twitter.com/mgechev
13. twitter.com/mgechev Lazy-load everything!
14. twitter.com/mgechev Lazy-load everything! …and let tooling take care of the rest
15. twitter.com/mgechev
16. twitter.com/mgechev
17. twitter.com/mgechev Route-based splitting
18. twitter.com/mgechev $ npm run build # For Angular CLI $ serve -s dist
19. twitter.com/mgechev Let’s emulate *really* bad conditions
20. twitter.com/mgechev
21. twitter.com/mgechev
22. twitter.com/mgechev Let’s take a look at the GA graph
23. twitter.com/mgechev
24. twitter.com/mgechev
25. twitter.com/mgechev - Main & Settings in same chunk ‣ Update of the source code - Pre-fetch FAQ when the user is at Home Possible optimizations
26. twitter.com/mgechev
27. twitter.com/mgechev early preview
28. twitter.com/mgechev $ vim webpack.config.js
29. twitter.com/mgechev const { GuessPlugin } = require('guess-webpack'); // ... plugins: [ // ... new GuessPlugin({ GA: 'XXXXXX' }) ] // ...
30. twitter.com/mgechev
31. twitter.com/mgechev
32. twitter.com/mgechev How it works…
33. twitter.com/mgechev - guess-ga - guess-parser - guess-webpack Packages
34. twitter.com/mgechev guess-ga Fetching structured data from Google Analytics
35. twitter.com/mgechev guess-parser Gets metadata by statically analyzing our app
36. twitter.com/mgechev guess-webpack Set of webpack plugins which automate the build
37. twitter.com/mgechev /a /a/a /a/b /b /b/a /
38. twitter.com/mgechev Markov Chain / /a /a/:id /b /b/a / 0 0.3 0 0.7 0 /a 0 0 0.9 0.1 0 /a/:id 0 1 0 0 0 /b 0 0 0 0 1 /b/a 0 1 0 0 0 /a /a/a /a/b /b /b/a /
39. twitter.com/mgechev /a /a/a /a/b /b /b/a / Activity: / /a /a/:id /b /b/a / 0 0.3 0 0.7 0 /a 0 0 0.9 0.1 0 /a/:id 0 1 0 0 0 /b 0 0 0 0 1 /b/a 0 1 0 0 0 Probability threshold: 0.5
40. twitter.com/mgechev /a /a/a /a/b /b /b/a / Activity: / /a /a/:id /b /b/a / 0 0.3 0 0.7 0 /a 0 0 0.9 0.1 0 /a/:id 0 1 0 0 0 /b 0 0 0 0 1 /b/a 0 1 0 0 0 Probability threshold: 0.5
41. twitter.com/mgechev /a /a/a /a/b /b /b/a / Activity: / /a /a/:id /b /b/a / 0 0.3 0 0.7 0 /a 0 0 0.9 0.1 0 /a/:id 0 1 0 0 0 /b 0 0 0 0 1 /b/a 0 1 0 0 0 Probability threshold: 0.5
42. twitter.com/mgechev / /a /a/:id /b /b/a / 0 0.3 0 0.7 0 /a 0 0 0.9 0.1 0 /a/:id 0 1 0 0 0 /b 0 0 0 0 1 /b/a 0 1 0 0 0 /a /a/a /a/b /b /b/a / Activity: - Download b.bundle.js Probability threshold: 0.5
43. twitter.com/mgechev /a /a/a /a/b /b /b/a / Activity: - Download b.bundle.js / /a /a/:id /b /b/a / 0 0.3 0 0.7 0 /a 0 0 0.9 0.1 0 /a/:id 0 1 0 0 0 /b 0 0 0 0 1 /b/a 0 1 0 0 0 Probability threshold: 0.5
44. twitter.com/mgechev /a /a/a /a/b /b /b/a / Activity: - Download b.bundle.js / /a /a/:id /b /b/a / 0 0.3 0 0.7 0 /a 0 0 0.9 0.1 0 /a/:id 0 1 0 0 0 /b 0 0 0 0 1 /b/a 0 1 0 0 0 Probability threshold: 0.5
45. twitter.com/mgechev /a /a/a /a/b /b /b/a / / /a /a/:id /b /b/a / 0 0.3 0 0.7 0 /a 0 0 0.9 0.1 0 /a/:id 0 1 0 0 0 /b 0 0 0 0 1 /b/a 0 1 0 0 0 Activity: - Download b.bundle.js - No action Probability threshold: 0.5
46. twitter.com/mgechev /a /a/a /a/b /b /b/a / / /a /a/:id /b /b/a / 0 0.3 0 0.7 0 /a 0 0 0.9 0.1 0 /a/:id 0 1 0 0 0 /b 0 0 0 0 1 /b/a 0 1 0 0 0 Activity: - Download b.bundle.js - No action Probability threshold: 0.5
47. twitter.com/mgechev /a /a/a /a/b /b /b/a / / /a /a/:id /b /b/a / 0 0.3 0 0.7 0 /a 0 0 0.9 0.1 0 /a/:id 0 1 0 0 0 /b 0 0 0 0 1 /b/a 0 1 0 0 0 Activity: - Download b.bundle.js - No action Probability threshold: 0.5
48. twitter.com/mgechev /a /a/a /a/b /b /b/a / / /a /a/:id /b /b/a / 0 0.3 0 0.7 0 /a 0 0 0.9 0.1 0 /a/:id 0 1 0 0 0 /b 0 0 0 0 1 /b/a 0 1 0 0 0 Activity: - Download b.bundle.js - No action - Download a.bundle.js Probability threshold: 0.5
49. twitter.com/mgechev - https://mgv.io/dd-bundling - https://mgv.io/cost-of-js - https://mgv.io/predictive-fetching - https://mgv.io/guess References
50. Thank you! twitter.com/mgechev github.com/mgechev blog.mgechev.com