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    <p>A wild guess might be that JAVA depends on some kind of "application" server, while PHP doesn't -- which means a new environnement has to be created each time a PHP page is called.</p> <p><em>(This was especially true when PHP was/is used as a CGI, and not as an Apache module or via FastCGI)</em></p> <p><br> Another idea might be that C# and JAVA compilers can do some heavy optimisations at compile time -- on the other side, as PHP scripts are compiled <em>(at least, if you don't "cheat" with an opcode cache)</em> each time a page is called, the compilation phase has to be real quick ; which means it's not possible to spend much time optimizing.</p> <p><br> Still : Each version of PHP generally comes with some amelioration of the performances ; for instance, you can gain between 15% and 25% of CPU, when switching from PHP 5.2 to 5.3.</p> <p>For instance, take a look at those benchmarks :</p> <ul> <li><a href="http://sebastian-bergmann.de/archives/745-Benchmark-of-PHP-Branches-3.0-through-5.3-CVS.html" rel="nofollow noreferrer">Benchmark of PHP Branches 3.0 through 5.3-CVS</a></li> <li><a href="http://ez.no/developer/forum/developer/performance_php_5_2_vs_php_5_3_huge_gain" rel="nofollow noreferrer">Performance PHP 5.2 vs PHP 5.3 - huge gain</a></li> <li><a href="http://blog.pascal-martin.fr/post/bench-php-5.2-vs-php-5.3-cpu" rel="nofollow noreferrer">Bench PHP 5.2 vs PHP 5.3</a> <em>-- disclaimer : it's in french, and I'm the one who did it.</em></li> </ul> <p><br> One important thing, also, is that PHP is quite easy to scale : just add a couple of web servers, and voila !</p> <p>The problem you often meet when going from 1 to several servers is with sessions -- store those in DB or memcached <em>(very easy)</em>, and problem solved !</p> <p><br> As a sidenote : I would not recommend choosing a technology because there is a couple of percent difference of speed on some benchmark : there are far more important factors, like how well your team know each technology -- or, even, the algorithms you are going to use !</p>
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    1. POWhat makes PHP slower than Java or C#?
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