In my previous post I showed how to integrate Varnish Cache with a PHP application. The example can solve various simple problems but it might not be enough for a complex software. A good example is a multilingual application. One URL can have multiple caches. You might also need to know more about a user (is he logged in? has he received a notification? etc) to make some additional caching decisions.
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Varnish Cache is a web application accelerator. It stands in front of a web server and can cache any type of data. It stores data in memory and can speed up your application by a factor of 300-1000x depending on your architecture.
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Lets face it, WordPress is slow. With every request it has to go though thousands lines of code and multiple SQL queries to render a page. Very popular configuration for a WordPress site is Apache, mod_rewrite, mod_php, PHP and MySQL. It’s very good setup but can’t be consider the fastest (at least without any additional tweaking).
The good news is WordPress doesn’t have to be a speed demon. In most cases it’s just a CMS to produce static pages. If the content is static it doesn’t make any sense to waste CPU cycles on re-rendering the same HTML over and over again.
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