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That’s quite a list! Google made an attempt to divide them into categories, but it’s still a lot to fathom. I would like to tell you all about their tips, but that’s way too much for this little article. Since some tips are related to or affect others, I will instead write additional articles to describe the tips in a more categorized manner.
How Not to Use the Tips
Some people try to resolve performance issues by focusing on performance tips. The tips will surely help us as we develop or modify webapps, but they are not a good methodology for resolving existing problems. Neither Google nor Yahoo have suggested they be used in this manner.
A better approach is to profile the transaction as it makes its way through the various application layers and system services. This tells us which part of the application or system is responsible for the slowdown. We can then do some application component deep dive monitoring to more closely identify the trouble spot. Once we know where the trouble is, we can skip right over the tips that have nothing to do with our problem and focus on the ones that may help.
As with any problem, identifying the cause must always come before implementing a solution. Anything else is hit and miss.
Best Practices for Web Performance
Best Practices for Speeding Up Your Web Site by Yahoo’s Exceptional Performance Team. Published by Yahoo at developer.yahoo.com/performance/rules.html. Accessed 2011.11.30.
Fourteen Rules for Faster-Loading Web Sites by Steve Souders. Published by Steve Souders at SteveSouders.com/hpws/rules.php. Accessed 2011.11.30.
Ten Tips for Writing High-Performance Web Applications by Rob Howard. Published 2005/01 by Microsoft at msdn.microsoft.com/en-us/magazine/cc163854.aspx. Accessed 2011.11.30.
Web Performance Best Practices. Published by Google at code.google.com/speed/page-speed/docs/rules_intro.html. Accessed 2011.11.30.
Adherence Measurement Tools
Page Speed. Published by Google at code.google.com/speed/page-speed. Accessed 2011.11.30.
YSlow. Published by Yahoo at developer.yahoo.com/yslow/. Accessed 2011.11.30.
YSlow Ruleset Matrix. Published by Yahoo at developer.yahoo.com/yslow/matrix. Accessed 2011.11.30. Yahoo’s implicit rankings can be inferred from the second column of the table (weight). The bigger the number, the more important Yahoo considers the tip to be.
YSlow User Guide. Published by Yahoo at developer.yahoo.com/yslow/help/. Accessed 2011.11.30.
Let’s Make the Web Faster. Published by Google at code.google.com/speed/articles. Accessed 2011.11.30.
This is a directory of 20 links to performance-related articles.
The Not So Good Web Performance Tips by José Manuel Perez. Published 2010.12.28 by José Manuel Perez at blog.josemanuelperez.es/2010/12/yahoo-tips-website-performance-flush-bottom. Accessed 2011.11.30. José explains that two common tips do not work – putting scripts at the bottom of the page and flushing inside a <div> tag. See the following article by Nicholas Zakas for solutions to these issues.