<table role="table">
<thead>
<tr>
<th>Q</th>
<th>A</th>
</tr>
</thead>
<tbody>
<tr>
<td>Bug report?</td>
<td>yes</td>
</tr>
<tr>
<td>Feature request?</td>
<td>no</td>
</tr>
<tr>
<td>BC Break report?</td>
<td>no</td>
</tr>
<tr>
<td>RFC?</td>
<td>no</td>
</tr>
<tr>
<td>Symfony version</td>
<td>3.2.0</td>
</tr>
</tbody>
</table>
<p dir="auto">Here is our build performance.<br>
<a target="_blank" rel="noopener noreferrer nofollow" href="https://cloud.githubusercontent.com/assets/496233/22702619/9d87addc-ed61-11e6-9ab3-4ecfac2a753e.png"><img src="https://cloud.githubusercontent.com/assets/496233/22702619/9d87addc-ed61-11e6-9ab3-4ecfac2a753e.png" alt="screenshot from 2017-01-31 10 54 08" style="max-width: 100%;"></a></p>
<p dir="auto">After upgrade to Symfony 3.2, automated tests suite take 2x longer to finish.</p>
<p dir="auto">I tracked it down to this PR <a class="issue-link js-issue-link" data-error-text="Failed to load title" data-id="202647669" data-permission-text="Title is private" data-url="https://github.com/symfony/symfony/issues/21381" data-hovercard-type="pull_request" data-hovercard-url="/symfony/symfony/pull/21381/hovercard" href="https://github.com/symfony/symfony/pull/21381">#21381</a></p>
<table role="table">
<thead>
<tr>
<th>Q</th>
<th>A</th>
</tr>
</thead>
<tbody>
<tr>
<td>Bug report?</td>
<td>yes</td>
</tr>
<tr>
<td>Feature request?</td>
<td>no</td>
</tr>
<tr>
<td>BC Break report?</td>
<td>no</td>
</tr>
<tr>
<td>RFC?</td>
<td>no</td>
</tr>
<tr>
<td>Symfony version</td>
<td>3.2.3</td>
</tr>
</tbody>
</table>

<p dir="auto">Created simple gist to show this <a href="https://gist.github.com/tarlepp/be57391ceead9099d66e3500001ae58b">https://gist.github.com/tarlepp/be57391ceead9099d66e3500001ae58b</a> also tested with phpunit 5.7.11 and the results are the same.</p>
<p dir="auto">I tracked this to commit <a class="commit-link" href="https://github.com/symfony/symfony/commit/e59f0e0fd7323902fa025e2eae96ce9eb91b24c5#diff-0e793081ceb720201745c982a568903fL1046"><tt>e59f0e0</tt>#diff-0e793081ceb720201745c982a568903fL1046</a></p>
<p dir="auto">Maybe that <code class="notranslate">$container-&gt;setAlias('annotation_reader', 'annotations.cached_reader');</code> was removed by mistake ?</p>