"4 seconds" - remember that magical number ? If a web page doesn't load within 4 seconds, lot of visitors are likely to leave the website.
Tricks to Make Your Webpages Load Faster
Now several elements of a web page (like CSS, Iframes, Flash, Javascript, graphics) can increase the page loading time but how do you pinpoint the exact culprit that slowing the site ? A normal HTML web page may have ad scripts being served from Google Adsense servers, Flash video player from YouTube, images from Blogger Photos and so on.
PingDom Full Page Test is a useful tool that mimics a web browser and generates a nice interactive graph detailing the load time of different objects (like CSS Files, Javascript, etc) which are included in the web page.
You can view the list of objects either in load order or as a hierarchy. The hierarchy view allows you to see which objects are linked to in for example a CSS file. Objects that fail to load are highlighted in red.
PingDom's tool is based on SiteTimer [read review] but with a sleek and more user-friendly interface. If you have Firebug extension on Firefox, goto the "Net" tab and it will also show similar data.
tools.pingdom.com | example | How fast your site loads ?]