RESOLVED DUPLICATE of bug 119882 119350
Speed up moving cursor/selection up or down past non-renderered elements 
https://bugs.webkit.org/show_bug.cgi?id=119350
Summary Speed up moving cursor/selection up or down past non-renderered elements
Ryosuke Niwa
Reported 2013-07-31 13:43:34 PDT
Merge https://chromium.googlesource.com/chromium/blink/+/965746ed22a5e210eb8c33adf300deab9a9c8332 Skips calling firstPositionInOrBeforeNode when a node doesn't have a renderer, since there couldn't possibly be a visible position there. This was particularly wasteful when trying to move the cursor up when at the beginning of a document, as it did a O(n^2) scan through the document head. See bug for easy repro steps.
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Arpita Bahuguna
Comment 1 2013-08-19 04:33:02 PDT
http://trac.webkit.org/changeset/154274 fixes this issue.
Darin Adler
Comment 2 2013-08-19 08:47:31 PDT
*** This bug has been marked as a duplicate of bug 119882 ***
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