Update to Latest OS X Upgrade to the latest version of OS X. If you are upgrading from Lion to Mountain Lion, then tere’s no need to visit a store and fetch a box, and install a bunch of discs. Just click the Mac App Store icon on your Mac. Buy OS X Mountain Lion. And your Mac does the rest. Follow this Apple guide for more info Clean System and User Caches etc....
This easy little guide will help you with simple optimization tips for speeding up Ubuntu (12.04, 12.10, and 13.04) and other Ubuntu-based systems such as Linux Mint. The tips come in very handy for those using older computers with low RAM who need to boost their computer for better speed and performance and if you are just want a really fast and snappy computer on some regular hardware. Removing Ubuntu One client Saves >100 MB ram....
You may need to quickly switch between user-agent strings on the fly - when developing websites that need to work on both mobile browsers and desktop browsers user-agent switcing is a must-have. And some times you’ll expirence some archaic site blocking you because you’re not using Netscape or Internet Explorer (in an ancient version e.g. version 6). Chrome got a built-in user-agent switcher. All you need to do is to open the developer tools panel (use Ctrl+Shift+I shortcut) and click the wrench button (lower right corner) and click Overrides, and enable override user agent and elect the browser or device you want to emulate and reload the page....