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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Content extension with oft-repeated rules can cause slowdown"
href="https://bugs.webkit.org/show_bug.cgi?id=144010">144010</a>
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<th>Summary</th>
<td>Content extension with oft-repeated rules can cause slowdown
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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>528+ (Nightly build)
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<th>Hardware</th>
<td>All
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>Normal
</td>
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<th>Priority</th>
<td>P2
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<th>Component</th>
<td>CSS
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<th>Assignee</th>
<td>webkit-unassigned@lists.webkit.org
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<th>Reporter</th>
<td>beidson@apple.com
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<p>
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<pre>Content extension with oft-repeated rules can cause slowdown.
With a non-trivial extension adding multiple CSS rules per sub resource, we can't afford to create a new stylesheet each time, especially when they can often represent exactly the same rulesets.
We should have a single stylesheet per document and track which action-ids have added a display:none selector so we don't duplicate anything.
<rdar://problem/20618511></pre>
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