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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Typing is really slow when there are many input text fields on the page"
href="https://bugs.webkit.org/show_bug.cgi?id=157203">157203</a>
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<th>Summary</th>
<td>Typing is really slow when there are many input text fields on the page
</td>
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<th>Classification</th>
<td>Unclassified
</td>
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<th>Product</th>
<td>WebKit
</td>
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<th>Version</th>
<td>Safari 9
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<th>Hardware</th>
<td>Macintosh
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<th>OS</th>
<td>OS X 10.11
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>Normal
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<th>Priority</th>
<td>P2
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<th>Component</th>
<td>New Bugs
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<th>Assignee</th>
<td>webkit-unassigned@lists.webkit.org
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<th>Reporter</th>
<td>mcdado@gmail.com
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<pre>When there is a huge amount of input fields on a page, the typing performance is very bad. Such pages do exists, for example string translation backends with collapsable fieldsets for each single set/page to translate. In this cases the PHP backend even needs to increase the max_input_vars.
I created a page that shows how even on a current MBP Retina, performance is terrible. <a href="https://gist.github.com/mcdado/35d8ccb3d5c165c28ed6f70ffca68948">https://gist.github.com/mcdado/35d8ccb3d5c165c28ed6f70ffca68948</a>
Also, after a while fans start spinning up and they wind down only when the backlog of typed characters are displayed. I made a video here comparing performance with latest Firefox 48, Chrome 50, and Safari Technnology Preview 3: <a href="http://cl.ly/0v1g3a3P3h3o">http://cl.ly/0v1g3a3P3h3o</a>
I hope this helps!</pre>
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