Created attachment 175028 [details] A fixed-height wrapping cell with 140000 character string The attachment contains a single cell with a long (140000 char) string; the cell is formatted to wrap, and the row is set to fixed height. It takes long to open the file, or to select the cell. Possibly this could be optimized somehow? It looks similar to tdf#144513, but seems to be different, not blocking at TextEngine::CreateLines. This time it spends time at ImpEditEngine::FormatDoc.
Created attachment 175039 [details] perf flamegraph Here's a Flamegraph retrieved on pc Debian x86-64 with master sources updated today + gen rendering.
I confirm it's slow indeed.
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*** Bug 119362 has been marked as a duplicate of this bug. ***
*** Bug 120446 has been marked as a duplicate of this bug. ***
Luboš Luňák committed a patch related to this issue. It has been pushed to "master": https://git.libreoffice.org/core/commit/e3830b06a9886620ed432a011d2de2abbb7a3a12 don't FormatDoc() a whole long text if not necessary (tdf#144515) It will be available in 7.4.0. The patch should be included in the daily builds available at https://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More information about daily builds can be found at: https://wiki.documentfoundation.org/Testing_Daily_Builds Affected users are encouraged to test the fix and report feedback.