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All of my JavaScript files are already at the bottom but Google Page Speed is giving this suggestion to improve speed:
Defer parsing of JavaScript
88.6KiB of JavaScript is parsed during initial page load. Defer parsing JavaScript to reduce blocking of page rendering. http://ajax.googleapis.com/ajax/libs/jquery/1.5.1/jquery.min.js (76.8KiB) http://websiteurl/js/plugins.js (11.7KiB) http://websiteurl/ (109B of inline JavaScript)
This is the my html (example)
<html>
<head>
<!--[if lt IE 9]><script src="//html5shim.googlecode.com/svn/trunk/html5.js"></script><![endif]-->
<head>
<body>
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.5.1/jquery.min.js"></script>
<script>!window.jQuery && document.write(unescape('%3Cscript src="js/libs/jquery-1.5.1.min.js"%3E%3C/script%3E'))</script>
<script src="js/plugins.js"></script>
<script>$(document).ready(function() {
$("#various2").fancybox({
'width': 485,
'height': 691,
});
});</script>
</body>
</html>
What should I do to increase performance by using defer?
Is it only for Google chrome or for all?
829
Defer parsing of Javascript means using " defer " or " async " to avoid render blocking of a page. This HTML command instructs the browser to execute/parse the scripts after (defer) or asynchronously (in parallel) to the page loading. This allows the content to show without waiting for the scripts to be loaded.
You should use defer for all other scripts. defer is great because it: Gets loaded as soon as possible — so it reduces load times. Doesn't execute until everything you need is ready — so all the DOM you need is there.
If you bypass GTM by inserting the external tags/scripts that you want on your site directly, it will improve performance immediately. Now you can't just put the defer attribute on the script tag since that doesn't work on inline scripts.
If you're looking for page performance then first and foremost you should move those scripts to the bottom of your page to allow the other assets to load.
Also use dns prefetch in the head to set the base domain for google-code
<link rel="dns-prefetch" href="//ajax.googleapis.com">
Since this is just a small piece of code, you could simply add it to your plugins.js file at the bottom then defer the plugins file.
<script src="js/plugins.js" defer></script>
That's what I'd do anyway, all my sites are optimized to 98 and 97 respectively in yslow and page speed.
Hope it helps.
-V
182
Add in <script type="text/javascript" defer="defer"> tag like that it works for me.
<script type="text/javascript" defer="defer" src="<?php echo $this->getSkinUrl();?>js/jquery.bxslider.js"></script>
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