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    <p><strong>TL;DR; Set realpath_cache_size to a value > 1000</strong></p> <p><strong>Edit 2:</strong> Problem solved in this PR: Try to set PHP.ini's realpath_cache_size to a value > 1000 A symfony requirement was recently added fixing this issue: <a href="https://github.com/sensiolabs/SensioDistributionBundle/commit/cf0179711b24d84d4a29d71a4010540f4c990bd8" rel="nofollow noreferrer">https://github.com/sensiolabs/SensioDistributionBundle/commit/cf0179711b24d84d4a29d71a4010540f4c990bd8</a></p> <p><strong>Edit:</strong> I just saw this answer: <a href="https://stackoverflow.com/a/17914570/980547">https://stackoverflow.com/a/17914570/980547</a> And it decreased page generation time by 4 on windows when I set realpath_cache_size=4096k in my php.ini (!)</p> <p><strong>Old answer:</strong></p> <p>So, I did a comparison between both with webgrind:</p> <p>On windows (fast computer), called app_dev.php:</p> <p><img src="https://i.stack.imgur.com/3gkQP.png" alt="Web toolbar"></p> <p>So you can see that the web toolbar shows a 764ms time generation (increased because of xDebug and profiling, but still relevant). Webgrind shows:</p> <ul> <li>651 calls to file_exists() for a time of 232ms (which is a lot!)</li> <li>603 calls to filemtime() (211ms)</li> <li>230 calls to UniversalClassLoader->loadClass() (119ms)</li> <li>230 calls to UniversalClassLoader->findFile() (38ms)</li> </ul> <p>On linux (slow computer), app_dev.php:</p> <p><img src="https://i.stack.imgur.com/AVlL8.png" alt="Web toolbar"></p> <p>298ms of total generation time (which is more than twice less than on windows).</p> <ul> <li>237 calls to UniversalClassLoader->findFile() (36ms => 4 times less)</li> <li>237 calls to UniversalClassLoader->loadClass() (20ms => 2 times less)</li> <li>623 calls to file_exists() (4ms only !!!)</li> <li>605 callsd to filemtime() (4ms only !!!)</li> </ul> <p>The problem seems to be file_exists() and filemtime(), which are much slower on windows than on Linux. On windows, PHP is looking for files with file_exists, filemtime, loadClass or findFile for 60% of the time. Is that a known problem ?</p> <p>Edit : so the problem is only for the dev environment, in production no file_exists are done since everything is cached.</p>
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    1. COGood find. I believe the ``file_exists()`` and ``filemtime()`` is to check if the config has changed. Is there a way to prevent these calls and clear the cache manually like in sf1?
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    2. COYes there is, of course in production there is no such calls, but the interesting thing is the difference between Windows and Linux with development environment.
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