JavaScript is a single-threaded language, to perform large computation & operations, the preference will be multi-threading.
We can achieve multi-threading in JavaScript with the help of HTML Web Workers API.
A web worker is a JavaScript that runs in the background, independently of other scripts. To know more about web workers please read here
How did it start?
Back in 2015, I was working on a product, the tech stack I used was React & Flux.
The product requirement was to create a dashboard having multiple charts to plot different sets of data.
There are a lot of JavaScript libraries to draw charts, I choose C3 to render the charts.
The chart has to show thousand of data points depending upon the time range.
Drawing thousands of the data points on multiple charts meaning,

#javascript #webworker #web-development #react #web-performance