Poor application performance leads to user churn and reduced revenue, highlighting the need to understand JavaScript's single-threaded nature.
The call stack is a last-in, first-out (LIFO) data structure that the JavaScript engine uses to track function execution.
Asynchronous operations like promises and timers are managed by the event loop, which prioritizes the microtask queue over the macrotask queue.
Web Workers enable true parallelism by running scripts on a background thread, communicating with the main thread via the postMessage API.
A live demo shows how running a CPU-intensive chess move calculation in a Web Worker keeps the main thread responsive and the UI smooth.
Web Workers cannot access the DOM and incur overhead from data serialization, but the OffscreenCanvas API allows direct canvas manipulation from a worker.
Libraries like Partytown can run third-party scripts in a worker, while frameworks like Neo.js are built entirely around the Web Worker paradigm.
Web Workers are a powerful tool for specific performance bottlenecks but should be considered only after optimizing the main thread code first.
Hubert Burda Media
München, Germany
Sensory-Minds GmbH
Offenbach am Main, Germany
24:08Matteo Collina
49:57Andrew Burnett-Thompson & David Burleigh
30:36Christian Woerz
46:46Chris Ferdinandi
27:27Michele Riva
14:44Chris Heilmann
27:01Shem Magnezi
42:46Avichay Eyal
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Jobs that call for the skills explored in this talk.
nono
nono
Owen Ltd
Charing Cross, United Kingdom
Wündertalent
Brighton and Hove, United Kingdom