What are the best ways to enhance performance for ajax requests using Jquery?

Currently, I am in the process of developing a mobile application that utilizes jquery mobile, jquery, and a PHP backend. My issue arises when dealing with certain pages as there are numerous ajax requests being sent and received simultaneously, resulting in a noticeable decrease in performance. This also leads to memory leaks, causing the app to crash especially on low network connections.

I am seeking advice on potential strategies for optimizing these ajax requests.

Furthermore, it is worth noting that some ajax requests are scheduled periodically (e.g., once per second) while others are triggered by specific events.

javascriptphpjqueryajax

Answer №1

Let's start by clarifying that properly written Ajax code does not have memory leaks. If there is a leak, it is usually due to incorrect coding practices rather than the use of Ajax itself.

There are several optimizations you can implement:

  1. Consolidate multiple server requests into one larger request to minimize roundtrips, save bandwidth, conserve battery life, and enhance performance.

  2. Avoid polling too frequently. Opt for smarter polling intervals based on server activity.

  3. Adjust the polling frequency by analyzing expected activity patterns, consider "long polling," or switch to webSockets for server push without continuous polling.

  4. Identify and address any issues contributing to excessive memory usage to prevent memory leaks. When coded correctly, numerous Ajax calls should not lead to memory leaks, although they may impact battery life.

Additionally, examine popular social web applications using the debugger and network tab to learn from their strategies in handling high volumes of traffic. Studying successful apps can offer insights into effectively managing this issue.

Answer №2

Why Long Polling Outperforms Traditional Polling

Instead of repeatedly polling at regular intervals, it is more efficient to set a timeout on the server-side and only send a response after a certain number of loops have passed. This approach is particularly beneficial for single-page applications (SPA). When employing polling, make sure to extend the time interval each time you receive an empty response.

Optimize Requests by Event Grouping, not Entity Separation

Imagine that you are retrieving new messages every 10 seconds through one poll request, while also fetching notifications in another separate poll request at the same frequency. Instead of making two distinct requests, consolidate them into a single AJAX call that returns a comprehensive JSON response. This allows you to update DOM elements more efficiently on the client side.

Consider Using Server-Sent Events or Sockets Whenever Feasible

By utilizing sockets or Server-Sent Events, you can significantly reduce the number of requests made, as these methods only notify the client when there is actually relevant activity happening on the server. For further comparison between different communication technologies, refer to this informative resource.

Answer №3

Check out these recommendations for optimizing your application

To start with

  • Start by identifying and fixing any memory leaks in your code. Conduct thorough testing in a sandbox environment to detect and resolve any issues related to memory leaks.

Next

  • Minimize the number of requests made by your application. Determine the optimal thresholds for triggering requests and consider batching them whenever feasible.

  • Utilize GET requests whenever applicable, as they are simpler and more efficient. This is particularly crucial for applications with high request volume.

  • Select the most suitable data format, whether it's plain text, JSON, or XML, based on its impact on your application performance. Enable data compression on your server if feasible.

  • Optimize your server by implementing proper Expire or Cache-Control headers for served content and utilizing ETags if possible.

  • Consider leveraging a CDN to distribute your content closer to users geographically, resulting in faster application performance.

Answer №4

For those looking to establish a chat server or send quick messages to the server, utilizing technologies like socket.io for webSockets is highly recommended.

Answer №5

Optimizing jQuery AJAX calls involves following 3 key steps:

  • Include the done callback function as a parameter in your function call
  • Make sure to return the jqXhr object from the function and then assign the done callback to it
  • Another option is to switch to using jQuery.ajax() directly and pass the entire options object

To learn more about optimizing jQuery AJAX calls, check out this helpful resource: How to optimize (minimize) jQuery AJAX calls

Answer №6

Utilizing the cache feature in an Ajax call can greatly improve performance by preloading data during the initial request and storing it for future use. This eliminates the need for repeated Ajax calls and allows for data manipulation using cached information.

Furthermore, optimizing Ajax calls involves minimizing the amount of data transferred back and forth between the server and client. By refining the data requested and sent during each Ajax call, response times can be significantly improved.

In addition to these techniques, overall optimization relies heavily on well-structured code and database logic. Developing streamlined code and efficient database practices not only enhance performance but also contribute to preventing application crashes.

Answer №7

  1. Implement AJAX callback to create a variable and utilize it efficiently.
  2. Instead of creating a new XMLHttpRequest instance every second, improve performance by initiating a new AJAX request only after the previous one is completed.

  3. To optimize memory usage, clear object data once it has been sent to the server:

    array.length = 0; object = null; image.src = ""; file = null;

Answer №8

According to @jfriend00, Ajax requests do not create memory leak issues...

It seems like your code might be causing the problem!

An efficient way to achieve what you want is by establishing a Socket Layer connection with your Data Layer Service. This allows for notifications when there are changes in the domain model instead of continuous polling.

Take a look at Socket.io for more information...

If setting up a Socket Layer isn't feasible, there may not be many options to improve performance...

In addition to code enhancements like refactoring, one approach worth considering is implementing a "Tail Management System"...

  • Learn about how Promises work (es6, jQuery, Q, bluebird)
  • Create a QueueService, which is a simple JavaScript Class that can serialize all (Ajax) tasks (promises);
  • Integrate the QueueService between Controllers and Data Layer Access Services
  • Set up a lightweight CacheSystem to eliminate unnecessary AjaxRequests!

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