As is the case with data compression in general the greatest savings to are to be made when the formats to be compressed are of a textual nature. Whilst ASCII or HTML files can be easily compressed using gzip by 75% or more, already optimized files formats such as JPEG's, executable or archive files tend not to compress as well if at all.
Trust is everything in this day and age. You have to trust a lot of people, from the guy who gives you directions to your local plumber. After all, you're not always the authority. However, when developing applications for the web, you must assume the role of authority. Otherwise, the user will assume the role, which is a big gamble: total data integrity, data corruption, or diversion of data -- if the user is the authority, you don't know what the results will be.
In-function caching can be used to greatly improve the performance of our software. Applying this technique effectively is important to avoid spiraling memory usage and bizarre bugs that can be caused by old cache data lingering around.
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