Here’s a list of a few easy-install and no-maintenance WordPress plugins that will speed up your blog. These plugins are free and don’t use up server resources.

As you may know Google now takes into account the website load times, so the slower your website is the less chances it has to show up in search results.

Simply download those plugins and activate them, they will do the job.

Use Google Libraries
Your WordPress installation loads certain files every time the webpage is called. This plugin allows those files to be taken from Google’s AJAX Library API. This way your server loads less files every and saves time by loading javascript libraries distributed with WordPress from Google, not from your WordPress install.

WP Smush.it
This plug seamingly integrates with your blog and optimizes your images and makes their files smaller and thus loading faster. Smush.it optimizes compression and shows you how much your images have shrunk. Every time you add to a post will be automatically optimized, but if you already have images in your WordPress’ media library then simply go there and click Smushit link to optimize them.

Smart 404
If your visitors encounter a 404 error this plug will redirect them to a most similar page or will list suggestions for the visitor instead just a plain 404 error page