When I import this pdf file in Draw and try to select many items on the first page by drawing a rectangle with the mouse (or pressing CTRL+A) , it takes very long until the selection is done. https://www.st.com/resource/en/datasheet/stm32f030f4.pdf
It's pretty OK on Windows. Version: 7.2.0.0.alpha0+ (x64) Build ID: 315c7570c4a72f4c834086082825533b1e50d1bf CPU threads: 4; OS: Windows 6.3 Build 9600; UI render: Skia/Raster; VCL: win Locale: nl-NL (nl_NL); UI: en-US Calc: CL Could you please copy help/about screen.. there are multiple backends (GTK3/GEN/etc) on linux
Created attachment 168480 [details] About window screenshot
Confirmed. It isn't specific to imported PDFs. You can duplicate the problem like this: Draw a small object like a filled ellipse. Select, use Duplicate to make 15 copies at a small offset. Now select all 16, copy, click off them, paste, move. Repeat, doubling each time. Here are the times I get to select N ellipses on 2 different PCs running older and more recent LibreOffice. Note that PC #2 is much faster than #1 in general. #1) Pentium-M, LibreOffice-6.2.8 32-bit on 32-bit Linux, Gtk2 # objects: seconds to select: 32 <1 64 <1 128 <1 256 <1 512 1 1024 2 #2) Core-2, LibreOffice-6.4.6 64-bit on 64-bit Linux, Gtk3 # objects: seconds to select: 32 <1 64 <1 128 1 256 3 512 17 1024 128 I think I would call this a non-linear performance regression.
Do you reproduce the issue if you launch LibreOffice from commandline with 'SAL_USE_VCLPLUGIN=gen' ?
The issue is not reproducible when I run LibreOffice with: $SAL_USE_VCLPLUGIN=gen libreoffice
[Automated Action] NeedInfo-To-Unconfirmed
Confirmed - me too. The selection speed goes back to 'normal' with SAL_USE_VCLPLUGIN=gen. The whole UI looks different though, and general graphics seems a bit slower with this. What is this doing? It changes the whole display 'driver', doesn't it? With the default for me on Linux being gtk3, and this environment variable uses a 'generic' or 'general' driver? If so then I guess this is a Gtk+3 problem and maybe not fixable in LibreOffice, unfortunately.
Tested pressing CTRL+A on first page, confirm with Version: 7.2.0.0.alpha0+ / LibreOffice Community Build ID: 5348b3946b8f2b9581cdd8b40fa774c2a9d23868 CPU threads: 4; OS: Linux 5.8; UI render: default; VCL: gtk3 Locale: cs-CZ (cs_CZ.UTF-8); UI: en-US Calc: threaded
I'd guess its a11y related and windows might be just as slow in a11y-enabled mode
time is spent in a11y svx/source/accessibility/ChildrenManagerImpl.cxx ChildrenManagerImpl::UpdateSelection
Caolán McNamara committed a patch related to this issue. It has been pushed to "master": https://git.libreoffice.org/core/commit/3d45088a4885671a12dfa48e6c650cb896f7078e Resolves: tdf#139220 with ~1000 selected shapes a11y UpdateSelection crawls It will be available in 7.3.0. 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.
That improves this, done in trunk and backports to 7-2 and 7-1 in gerrit. https://gerrit.libreoffice.org/c/core/+/120618 may also make a measurable improvement.
Caolán McNamara committed a patch related to this issue. It has been pushed to "libreoffice-7-1": https://git.libreoffice.org/core/commit/d6fcc3fb03a7bc35eb35ab7948803ff2682507de Resolves: tdf#139220 with ~1000 selected shapes a11y UpdateSelection crawls It will be available in 7.1.6. 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.
Caolán McNamara committed a patch related to this issue. It has been pushed to "libreoffice-7-2": https://git.libreoffice.org/core/commit/7ea5763aa766d0b4f25b0f089873dc2c8726cec5 Resolves: tdf#139220 with ~1000 selected shapes a11y UpdateSelection crawls It will be available in 7.2.1. 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.
Very fast now. Verifed with Version: 7.3.0.0.alpha0+ / LibreOffice Community Build ID: 5b025285b3528910a4360899abb2bbbaadc72c97 CPU threads: 4; OS: Linux 5.11; UI render: default; VCL: gtk3 Locale: ro-RO (ro_RO.UTF-8); UI: en-US Calc: threaded