Efficiently downloading and executing Javascript
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The document discusses different techniques for efficiently downloading and executing Javascript resources on a webpage. It compares approaches like using script tags to join Javascript files, injecting scripts asynchronously, triggering scripts with callbacks, downloading scripts in parallel and deferring execution. The goal is to reduce blocking of DOM loading, enable parallel downloads, decrease load time and share cached resources across pages. Various tradeoffs of blocking DOM loading, parallelization, load time and resource sharing are considered for each approach.
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Efficiently downloading and executing Javascript
- 1. Efficiently downloading and executing Javascript Pablo Moretti MercadoLibre
- 2. Agenda ● Script tag ● Script injection (async) ● Script injection with callback ● Download and execution in order Let's go …
- 3. Example Page Javascript resources ● Jquery, Chico & 3 dummy resources ✕ Blocked DOM ✕ Load time ✔ Parallel requests * ✔ Share resources
- 4. Script tag First approach, join all javascripts. ✕ Blocked DOM ✕ Parallel requests * ✕ Load time ✕ Share resources ✔ Less requests * 90% of the browsers that navigate ML support 6 or more concurrent connections per domain.
- 5. Script tag A better idea is to join only the dummies js and put the script in the bottom. ✕ Blocked DOM ✔ Share resource ✔ Less requests ✔ Parallel requests ✔ Load time
- 6. Script injection (async) This is the injection of script from another script. ✕ Blocked onload ✕ Parallel requests ✕ Share resources ✔ No blocked DOM ✔ Load time ✔ Less requests
- 7. Script injection with callback We could use a library and ✔ No blocked onload trigger it in onload event. ✔ Share resources ✔ Less requests ✕ Parallel requests ✕ Load time
- 8. Download and execution in order We could use a better library ✔ No blocked onload ✔ Parallel requests and trigger it in onload event. ✔ Load time ✔ Less requests ✔ Share resources
- 9. Defer & queue javascript inline Using a similar technique of GA track, we can defer the execution of javascipt inline. The array is processed when we want. For example, when we download the dependency.
- 10. Questions ?