Web hosting provider - 941Chapter 47Converting Static HTML SitesPerformance and CachingAt this
941Chapter 47Converting Static HTML SitesPerformance and CachingAt this stage you should do some performance testing and evaluation. You want to get decentestimates of: .Server latency:How long the code takes your server to produce. .Network latency:How long it takes to get the code down the pipe to you. .Browser latency:How long it takes a browser to completely render the page. You can measure server latency by putting microtime()calls at the beginning and end ofeach page, like this: This duration should average to less than one second on every page. If it s more than one sec- ond per page load, you have an architecture problem. Subseconds of latency are achieved bymuch larger and more complicated sites than yours. Make sure that you test this on a setupsimilar to your production environment a production server can be several times fasterthan a development server, so unacceptable times in development can magically becomeacceptable in production. The reason server latency is particularly bad is that it ends up costing you money to scaleyour site. Because your code hogs processor cycles, threads, database connections, andother resources longer than it should, you need to invest more in hardware than a zippier site with similar features. The cure for this type of performance problem is to simplify yourarchitecture, particularly those features (templates, objects, message catalogs, and so on) that are known to add server latency. Network latency is (insofar as Web developers can affect it) usually a function of how largeyour page is. To test this, you need to save an HTML page and all its attendant graphic files(including ads) and note their combined size. Divide by 40 kilobytes per second (a realisticestimate of the speed of a 56K modem) for a ballpark estimate of how long your data spendson the wire. Heavy pages also cost you money, especially if you pay for metered bandwidth. Your Webservers can t take another request until they finish sending all the data from this one andthe longer it takes, the fewer available threads your Web servers have at any given time. Youcan sometimes finesse the fat-page problem temporarily by looking into transparent pagecompression Apache, for example, can gzipany file before serving it up in a way that istotally invisible to the user but in the long run you just need to make your pages lighter.
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