[Libreoffice-bugs] [Bug 137794] New: FILEOPEN: QT5 VCL with default renderer (not cairo) is much slower at opening slides

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=137794

            Bug ID: 137794
           Summary: FILEOPEN: QT5 VCL with default renderer (not cairo) is
                    much slower at opening slides
           Product: LibreOffice
           Version: 7.0.2.2 release
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Impress
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: sergio.callegari at gmail.com

Description:
Trying to track the progress of the QT5 VCL, I have tried opening some impress
documents with the QT5 VCL.

Unless I also use SAL_VCL_QT5_USE_CAIRO, the rendering of the fonts in my
slides is extra bad (which I think is expected for the time being). However, I
have also noticed that the slides are much much slower to open.

Since I haven't seen this reporting, I though it may be useful to have it on
the tracker.

Steps to Reproduce:
Open a document with
SAL_USE_VCLPLUGIN=qt5 libreoffice7.0 document.odp
and
SAL_USE_VCLPLUGIN=qt5 SAL_VCL_QT5_USE_CAIRO=1 libreoffice7.0 document.odp

Actual Results:
Without SAL_VCL_QT5_USE_CAIRO=1 opening the document is quite slow.

Expected Results:
Speed to open the document should be approximately the same.


Reproducible: Always


User Profile Reset: No



Additional Info:
Version: 7.0.3.1
Build ID: d7547858d014d4cf69878db179d326fc3483e082
CPU threads: 4; OS: Linux 5.4; UI render: default; VCL: qt5
Locale: it-IT (it_IT.utf8); UI: en-US
Calc: threaded

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