Why You Should Avoid Too Much JavaScript

JavaScript is commonly used to make websites interactive and dynamic, but in certain cases it can cause the web browser to become stuck while it waits on the CPU to process input or any action that results in JavaScript code being executed. JavaScript that performs operations on large groups of items or is poorly written will take longer to complete. Perform your JavaScript code on smaller sets of items or use asynchronous execution to prevent the web browser from pausing or slowing down while the JavaScript process is working. The same web browser process that manages the web page display also manages the JavaScript actions and using unoptimized code can cause the rest of your web page to become unresponsive until the code finishes.

Improving website performance in this area can require advanced website development expertise, but with a little know-how,most JavaScript code can be rewritten to function more efficiently or set to work asynchronously. For optimized or properly written long-running JavaScript code, moving the code’s execution into a Web Worker is recommended. Web Workers allow web browsers to run JavaScript code in another process separate from the main web browser process that manages the web page.