data transfer – Ananova

Reducing Data Transfers Amount:
you can reduce your transfer amount by;
1) building simpler websites.
2) more efficient websites.
3) optimizing graphics.
4) Remove unwanted tags, white space and comments.
5) Capitalize on CSS, call java script externally instead of embedding in every page.
6) Do not use too many keywords.

Alternatively, Avoid fancy flash presentations or streaming audio. Limit your META tags to those absolutely necessary. Besides many search engines will only review the first few and ignore the rest.
Another good idea is to cache your website but you might want to set an expiry date in the HTTP headers so the browser will refresh the content after a certain time. Use mod-gzip. It could save you as much as 40% of your bandwidth. Out of control robots can also suck down your bandwidth like a black hole. So use robots.txt to keep spiders in check.

People often associate bandwidth with data transfer but all together they are different from each other. But however they have close connections. Bandwidth is how much data can be transferred at a time and data transfer is how much data is being transferred. Or in other words Bandwidth is the technology and data transfer is the gateway for bandwidth.
How It Affects Your Site:
Bandwidth and site uploading has direct relationship.That is,The less bandwidth you have, the slower your site takes to load . If you have more visitors, some of them will have to wait their turn. The least data transfer you have, the more often you’ll find your site unavailable because you’re reached the maximum allowed until a new month rolls by or you upgrade your account.

Determining Your Requirements:
Usually when a host talks about bandwidth, they are referring to your transfer. Hence its purely your assumption of choosing the required amount of bandwidth for your website. Most of this information is available from your traffic history. If you don’t have an existing site, provide an optimistic estimate if you intend to heavily promote the site. You can also do some of daily calculations on your website by;

Find out the daily averages of

Number of visitors / expected number of visitors
Page size including the graphics of the page
Page views / expected pages viewed by each visitor

Then, multiply them as follows:
Visitors x Page size x Page views x 30 days = Monthly Website Transfer
You should also throw in a small margin or error there to take into account email traffic and your own uploads to the server. If you offer downloads, then you should add the following:
Average/Expected downloads x File Size x 30 days = Monthly Download Transfer.