i am trying to reduce my webpage load time . When i am searching i come to this point preload css and javascript .   So i am trying to implement this in my html page  please see my html code before and after implementation  before  <html> <h...
Just asked my first question and got a great response. So helpful. Helped me create this bit of javascript to create two random numbers on the same page.  <script> window.onload = function(){ generateRandomNumber1(); generateRandomNumber2(); }&...
It is widely recommended that JS files should be put at the bottom of page to allow html codes to be loaded first. In this case, visitors will see something when waiting for full load of the page. However, I think this is disadvantageous for these re...
I want to preload all images on my page.  My page has some images used directly as links, i.e. as img tags within an a tag, as well as some images which are in the background-image property of some spans.  What's the best way to preload them all?...
I have a question concerning page speed and code optimization.  I have a page which is populated almost 100% through AJAX calls.  My question is: is it faster for me to code several empty divs, spans, whatever into the HTML of the page, then fill tho...
Loading external javascript via async script tag at the end of a webpage  I'm trying to find out what is the best way to load javascript in terms of page speed.  Let's take this example:  FILE.JS:  // Synchronous delay of 5 seconds var timeWh...
The motivation for this idea is that browser ad requests are often painfully slow and can block page rendering, not to mention consume the browser javascript thread. If a page loads several ads, that's a lot of unreliable, blocking third party ca...
I just learned about rel="preload" and I wonder when it should be used. I found different types of preloads like preloading with javascript etc. as well. Google recently announced it would rank faster loading pages higher (at least on mobile...
I'm working on a javascript intensive user-interface application. (At least it's intensive for me, it's my first serious javascript project).  I have a few jquery functions going whenever a div is rolled over or mouseout. For example ther...
I'm using billboard.js to display this type of chart somewhere below the fold of my page.  Adding the billboard JS code is causing my mobile page speed to decrease from 90+ to 75-80.  My code is structured like this:  <!-- chart area --> &l...

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