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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Web Inspector: DataGrid _updateVisibleRows dominates profiles of timeline recordings when data grid (Overview or TimelineDataGrids) is showing"
href="https://bugs.webkit.org/show_bug.cgi?id=157664">157664</a>
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<th>Summary</th>
<td>Web Inspector: DataGrid _updateVisibleRows dominates profiles of timeline recordings when data grid (Overview or TimelineDataGrids) is showing
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<th>Classification</th>
<td>Unclassified
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<th>Product</th>
<td>WebKit
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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>OS</th>
<td>All
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<th>Status</th>
<td>NEW
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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>Web Inspector
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<th>Assignee</th>
<td>webkit-unassigned@lists.webkit.org
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<th>Reporter</th>
<td>joepeck@webkit.org
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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>* SUMMARY
DataGrid _updateVisibleRows dominates profiles of timeline recordings when data grid (Overview or TimelineDataGrids) is showing.
Profiling Web Inspector while recording a timeline with a DataGrid showing absolutely kills performance. Hiding DataGrids (e.g. Scripts and Events / ProfileView) Overview graphs are almost flawless!
* STEPS TO REPRODUCE
1. Inspect theverge.com
2. Show Timelines Tab
3. Show Network + Layout + Scripts timelines
4. Select Layout and Rendering Timeline to show DataGrid
5. Reload
=> Lots of Forced layouts dominating time in DataGrid _updateVisibleRows</pre>
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