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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Web Inspector: capturing with Allocations timeline causes GC to take 100x longer and cause frame drops"
href="https://bugs.webkit.org/show_bug.cgi?id=158054">158054</a>
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<th>Summary</th>
<td>Web Inspector: capturing with Allocations timeline causes GC to take 100x longer and cause frame drops
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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>WebKit Nightly Build
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<th>Hardware</th>
<td>All
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<th>URL</th>
<td>http://bl.ocks.org/syntagmatic/6c149c08fc9cde682635
</td>
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
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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>Web Inspector
</td>
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<th>Assignee</th>
<td>webkit-unassigned@lists.webkit.org
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<th>Reporter</th>
<td>bburg@apple.com
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<th>CC</th>
<td>bburg@apple.com, graouts@webkit.org, joepeck@webkit.org, mattbaker@apple.com, nvasilyev@apple.com, timothy@apple.com, webkit-bug-importer@group.apple.com
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<pre>STEPS TO REPRODUCE:
1. Make a recording without allocations timeline, note the smooth framerate.
2. Make a new recording with allocations timeline enabled.
EXPECTED:
No change in framerate, maybe a small increase in GC
ACTUAL:
GC time goes from < 1ms to > 60ms, causing visible stutters
NOTES:
The page continues to stutter even after recording is stopped, and after the allocations timeline is turned off. The latter seems to indicate a separate bug, where we don't turn off the extra tracking work during GC.</pre>
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