Use Parallel DOM JS library to upgrade parts of your web application to run within Parallel DOMs isolated context as a separate sub process. If you use React, you can parallelize a React component while being able to pass props and callbacks.
Web DOM is infamously single threaded. That jazzy animation or that nifty interactive info graphic you built is great and modern but slows down your application.
Parallel DOM to the rescue! Now, run any Javascript or React component as a separate CPU thread.