[Webkit-unassigned] [Bug 157664] New: Web Inspector: DataGrid _updateVisibleRows dominates profiles of timeline recordings when data grid (Overview or TimelineDataGrids) is showing

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=157664

            Bug ID: 157664
           Summary: Web Inspector: DataGrid _updateVisibleRows dominates
                    profiles of timeline recordings when data grid
                    (Overview or TimelineDataGrids) is showing
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Inspector
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: joepeck at webkit.org
                CC: bburg at apple.com, graouts at webkit.org,
                    joepeck at webkit.org, mattbaker at apple.com,
                    nvasilyev at apple.com, timothy at apple.com,
                    webkit-bug-importer at group.apple.com

* 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

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