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Predictive Prefetching
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Minko Gechev
March 26, 2019
Programming
4
650
Predictive Prefetching
Minko Gechev
March 26, 2019
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Transcript
twitter.com/mgechev Predictive Prefetching twitter.com/mgechev github.com/mgechev blog.mgechev.com
twitter.com/mgechev twitter.com/mgechev github.com/mgechev
twitter.com/mgechev Evolution of the web UI Code-splitting Prefetching Guess.js Agenda
twitter.com/mgechev
twitter.com/mgechev
twitter.com/mgechev
twitter.com/mgechev https://medium.com/dev-channel/the-cost-of-javascript-84009f51e99e
twitter.com/mgechev lazy-loading
twitter.com/mgechev - Route-based - Component-based Lazy-loading strategies
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
twitter.com/mgechev How do we pick the priorities of the bundles
to pre-fetch?
twitter.com/mgechev
twitter.com/mgechev Lazy-load everything!
twitter.com/mgechev Lazy-load everything! …and let tooling take care of the
rest
twitter.com/mgechev
twitter.com/mgechev
twitter.com/mgechev Route-based splitting
twitter.com/mgechev $ npm run build # For Angular CLI $
serve -s dist
twitter.com/mgechev Let’s emulate *really* bad conditions
twitter.com/mgechev
twitter.com/mgechev
twitter.com/mgechev Let’s take a look at the GA graph
twitter.com/mgechev
twitter.com/mgechev
twitter.com/mgechev - Main & Settings in same chunk ‣ Update
of the source code - Pre-fetch FAQ when the user is at Home Possible optimizations
twitter.com/mgechev
twitter.com/mgechev early preview
twitter.com/mgechev $ vim webpack.config.js
twitter.com/mgechev const { GuessPlugin } = require('guess-webpack'); // ... plugins:
[ // ... new GuessPlugin({ GA: 'XXXXXX' }) ] // ...
twitter.com/mgechev
twitter.com/mgechev
twitter.com/mgechev How it works…
twitter.com/mgechev - guess-ga - guess-parser - guess-webpack Packages
twitter.com/mgechev guess-ga Fetching structured data from Google Analytics
twitter.com/mgechev guess-parser Gets metadata by statically analyzing our app
twitter.com/mgechev guess-webpack Set of webpack plugins which automate the build
twitter.com/mgechev /a /a/a /a/b /b /b/a /
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 /
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
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
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
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
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
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
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
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
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
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
twitter.com/mgechev - https://mgv.io/dd-bundling - https://mgv.io/cost-of-js - https://mgv.io/predictive-fetching - https://mgv.io/guess References
Thank you! twitter.com/mgechev github.com/mgechev blog.mgechev.com