Explore parallel computing techniques in ReactJS to enhance user experience in this conference talk from React Day Berlin 2019. Learn how to leverage modern APIs like Web Workers, WebAssembly, Worklets, and Service Workers to perform heavy computations on separate threads, preventing UI freezes and unresponsive applications. Discover strategies for implementing multithreading in JavaScript, traditionally a single-threaded language, to create smoother and more efficient React applications. Gain insights from Majid Hajian's experience in running parallel jobs in React.js projects, and understand how these techniques can transform user interactions from frustrating to delightful.