JavaScript runs on a single thread, which means intensive tasks can freeze the UI and hurt the user experience. To avoid this, you can offload heavy work to background threads using Web Workers. 🔧 When Web Workers are useful Processing images or videos in the browser Handling large datasets (sorting, filtering, transformations) Performing CPU-heavy calculations (e.g. simulations, analytics) Parsing large files like CSV, JSON, or XML Running cryptographic or hashing operations Managing real-time data streams without blocking the UI Web Worker implementation example // dataWorker.js self . addEventListener ( ' message ' , event => { const { items , taskType } = event . data ; const output = runBackgroundTask ( items , taskType ); self . postMessage ({ status : ' completed ' , result : output , }); }); function runBackgroundTask ( items , taskType ) { if ( taskType !== ' transform ' ) { return items ; } return items .…