Need help with web app performance. Any advice appreciated!

[jayashree10]

I am facing a lot of issues in the performance optimization of my web application. Can anybody help?
I have heard about reducing page load time, minimizing render-blocking resources, and optimizing images. But I don't know how to do it. Can anyone please share some techniques or tools you would use or are using to achieve these optimizations?"

[rproffitt]

So I looked at the Pixabulous Designs site and it seems fine. Also with about 10 other employees what do others at your company use?

[Dani]

Reducing page load time:

• Use a CDN such as Cloudflare or Fastly to serve your static images, javascript files, CSS files, etc.
• Make sure that your web server is as fast as it can be; If using PHP, use Opcache, etc.

Minimizing render-blocking resources

• Put critical JS and CSS files as HTTP link headers (Cloudflare automatically does this for you)
• Don't use third-party Javascript and make sure all your JS is lean, and you are deferring JS that isn't immediately needed on page load

[Biiim]

if you use javascript, or any programming language, you can cut out a lot of processor time by being smart in the program logic.
eg. if you do a loop, work out data you can before the loop eg.

$.each(myArray, function(item){
    var now = moment(myDate);
    //do something with now
})

//VS

var now = moment(myDate);
$.each(myArray, function(item){
    //do something with now
})

The first one will run moment(myDate); for every item in the array, the second does it only once.

Goes for any kind of program logic, try and solve things in a way that is simple.

I think the worst for performance are the ones that influence graphics and resizing the document, so for instance rather than forcing a gradient resize, you could make it wait until the resize has finished then render the page only once.

Also the Server & database can often do things much faster than the client side, so you can utilise that as well.

or create a cache of commonly needed data that is very fast to access, Redis is very good for fast caching data in memory