[Libreoffice-bugs] [Bug 118762] New: Long formula objects cause slowness (Windows-only)

bugzilla-daemon at bugs.documentfoundation.org bugzilla-daemon at bugs.documentfoundation.org
Sat Jul 14 16:56:28 UTC 2018


https://bugs.documentfoundation.org/show_bug.cgi?id=118762

            Bug ID: 118762
           Summary: Long formula objects cause slowness (Windows-only)
           Product: LibreOffice
           Version: 5.4.2.2 release
          Hardware: All
                OS: Windows (All)
            Status: UNCONFIRMED
          Keywords: bibisected, bisected, perf, regression
          Severity: normal
          Priority: medium
         Component: Writer
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: todventtu at suomi24.fi

Observed already in 5.4.2.2 on Win 10. No problem on Linux.

1. Open attachment 82055 on Windows
2. Scroll to second page and further (back and forth etc.)

Slowness is also observed when entering and exiting formula edit mode.

Funny note: had to start bibisecting at a point earlier (1000 commits) than the
latest commit in Win 5.4 repo - for some reason the problem was not seen in the
latest one.

Result:
https://cgit.freedesktop.org/libreoffice/core/commit/?id=a51b7a1c3a7e7cf7b0c733e1dec40288278c1884
tdf#103831, tdf#100986: Force using GDI when needed
Our DirectWrite renderer is incomplete and can’t handle rotated text or text
with horizontal scaling, so route these two through GDI for now.

The commit is, of course, famously blamed for many other regressions (all fixed
or wfm now).

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