According to the most recent study, 57% of your visitors will be gone if it takes 3 seconds tor your page to load.
There can be many reasons for a slow load time.
Here’s a nice service. Plug in a URL and it’ll tell you how long it took to load the page. Click on “waterfall chart” and you’ll see exactly what on the page is taking so long. Mouseover a slow time and get more details on why that element took so long to load. Then you can do something about it.
You can test in different browsers and from different locations. At this time it doesn’t have the newly released versions of browsers, but you can test on the most widely used ones.
That also give a great comparison of which browsers are fast and which slow.
