Download Calculator
How long does it take to download a big fat image, or mp3, or zip file? These calculators will show the time for various connection speeds. To get a realistic value as experienced by surfers, the miminum theoretical time is multiplied by 1½.
Pagesize Calculator
You are building a new web site and want to know how large your pages can be. Do you want them to show inside 10 seconds? Or is 20 seconds acceptable? How fast are your visitors? Worldwide, national, or on an intranet? Use this calculator to determine the maximum pagesize you should be aiming for.
Every image incurs a penalty of 0.2 seconds and 300 bytes. The time penalty is because the browser needs to send a request to the webserver and ask for the image. The 300 bytes penalty is for the http overhead that accompanies each and every image.
Images are often used more than once in a website, such as the background, logo, and navigation buttons. They are loaded only once into the cache of the browser, usually on the homepage. You can therefore disregard those images on sub-pages.
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