[Webkit-unassigned] [Bug 158074] New: Web Inspector: changes to selection interval on rendering frames timeline are choppy

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=158074

            Bug ID: 158074
           Summary: Web Inspector: changes to selection interval on
                    rendering frames timeline are choppy
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
               URL: http://bl.ocks.org/syntagmatic/raw/6c149c08fc9cde68263
                    5/geo.html
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Inspector
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: bburg at apple.com
                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

STEPS TO REPRODUCE:

1. Open page, create timeline recording
2. Go to rendering frames timeline
3. Zoom all the way out to get really narrow bars
4. Make a selection on the timeline and drag back and forth (or drag a selection)

EXPECTED:

overview selection is buttery smooth

ACTUAL:

It's very choppy, rendering only a few frames a second.

NOTES:

The data grid and pie chart are able to keep up, so maybe we are doing something dumb in the selection relayout logic.

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