JavaScript performance optimization tips and tricks

JavaScript is a programming language that is used to build web applications. It was developed in 1995 by Brendan Eich at the University of California, Berkeley. JavaScript has been around for a long time and remains one of the most popular languages for developing web applications today.

The language syntax has remained mostly unchanged from its original version, but there are many things you can do with it that other languages don’t offer. In this article, we will share a few tips and tricks to improve your JavaScript code performance.

Faster loops

The forEach() loop is a shorthand method for looping over an array of objects. This can be useful if you don’t need to modify the original array but still want to access its elements.

[{title: 'What is JavaScript?'}, {title: 'What is jQuery?'}];

for (let question of questions) { console.log(question); }

Avoid if statements where possible.

If you’re writing JavaScript, you’ll want to avoid if statements. They’re slow and less readable, making them much more difficult for other developers to work with. And because of that, they’re more prone to errors and bugs than different, more readable code patterns like callbacks or promises—and debugging those kinds of mistakes can be especially tricky when an entire class of functions depends on its success or failure being determined by one conditional branch in the middle (i.e., “if this condition is true”).

Additionally: If your functionality requires multiple calls back into the server every time something changes (such as updating a user’s profile), then using data from previous requests can help save time by allowing us not to have to re-request everything again after each change

Optimize your code before adding libraries

  • Don’t use libraries that are not needed.
  • Don’t use libraries that are not optimized.
  • Don’t use libraries that are not compatible with your code or other components of your application.
  • If a library is too extensive, it will slow down the loading of files and increase memory usage on your computer, which can cause problems for many sites and apps running on the same server simultaneously (this is especially true if multiple people are using the same server). * If a library is too complicated, it might not get used by anyone else because nobody understands how to use it properly—and then they’ll have wasted time learning something they weren’t going to use anyway!

Don’t delete objects; hide them.

An excellent way to think about object-oriented programming is to treat every object like a file in your computer. You can store data on an object, manipulate it by accessing its properties and methods, and then delete the objects when you’re done with it.

This approach has several advantages:

  • It makes your code more flexible because you don’t need to worry about whether or not the same code will work on different data types (objects). For example, suppose someone else wants to access your database but doesn’t know how best to query for specific information within it. In that case, they can still use one set of functions instead of having many different ones for each type of record stored by instance variables within their own program/functionality!

There are may other ways to increase the speed of your programs

There are a million ways to increase the speed of your programs, but here are a few:

  • Use a profiler. This will tell you what parts of your code are taking the most time and help you identify where it could be improved.
  • Use a code analyzer. This is similar to using a profiler, except that instead of looking at individual lines or functions within the program code, it seems at entire blocks of code at once (which may include multiple files). For example, if you’re writing an HTML page template and want to know how much time each section takes—such as tags versus tags—a good way would be to analyze both templates individually before combining them into one final product!
  • Use linting tools like jslint (JavaScript Lint). These tools check for specific rules when compiling JavaScript files so that developers don’t have any surprises when running their computer programs later down the road!


With these tips and tricks, you’ll be able to write code that runs more quickly and efficiently.