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a selection of common JavaScript libraries are already included that you can use for your JavaScript development

be selective about which pages you load your scripts on. If your plugin or theme has a script that only does something on one front-end or admin page, such as the theme’s options page, or maybe a page with a specific widget, you only need to load your script on that page. No point clogging things up and loading scripts on pages where they’re not being used!

it’s perfectly possible to prioritise scripts and styles and nominate whether they load in the header or footer from the comfort and safety of your functions.php. The benefit being that your theme / framework will work with a wider range of other plugins / child themes.

Optimising CSS & JavaScript With the above informatinon in mind aim to lower the amount of css and javascript files your theme has, for example include your reset.css in your style.css, and for wp-page-navi add it to your style.css too. Some plugins add css or JavaScript to your theme It’s a good idea to filter these files out and add them to your own style.css or a javascript file. Justin Tadlock has written a  useful guide on how to disable scripts and styles belonging to many plugins. http://justintadlock.com/archives/2009/08/06/how-to-disable-scripts-and-styles You can also minimise you css with CSS Drive’s CSS Compressor to lower your style sheets size by that extra bit. It all adds up!

10 Optimization Tips

Create Your Own Frontpage Slideshow

How to Highlight Search Terms with jQuery

In their last release, they enabled OpenGraph tags by default with no setting to disable it. Even when you already have WordPress SEO enabled and OpenGraph enabled in that. This is making people freak  out everywhere as double OpenGraph tags lead to problems with Google+ and with Facebook.

The best solution, honestly, is to install another plugin by Mark Jaquith, called Manual Control for Jetpack. This disables Jetpack automatic activation of new modules. Now you at least have to manually do something for stuff to break on your site when the Jetpack team decides to push new stuff.