September 2007
Intermediate to advanced
170 pages
4h 24m
English
Content preview from High Performance Web Sites
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MSN
Figure 17-17. http://www.msn.com
The MSN home page (http://www.msn.com), ranks in the middle among the sites examined in this chapter when it comes to total size and number of HTTP requests. It fails to meet some basic performance guidelines, due especially to the way ads are inserted. However, it has several positive performance traits not seen in any of the other web sites analyzed here. Let's start by looking at how MSN does ads, because this will come up in several of the following recommendations.
MSN uses IFrames to insert five ads into the page. As discussed
earlier, with regard to eBay, using IFrames is an easy way to remove
dependencies between the ads system and the HTML page generation system.
However, each IFrame results in an additional HTTP request. In the case
of MSN, each IFrame's SRC attribute
is set to about:blank, which doesn't
generate any HTTP traffic. However, each IFrame contains an external
script that inserts an ad into the page using JavaScript and document.write. Integrating the ad system and
the HTML page generation system would preclude the need for these five
HTTP requests. Instead of requesting a script that contains multiple
document.write statements, that
JavaScript could be inlined in the HTML document.
- Rule 1: Make Fewer HTTP Requests
The MSN home page has four scripts (other than the scripts used for ads), three of which are loaded very close together ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.