[Libreoffice-bugs] [Bug 139993] New: Extreme lagging with SVG's containing gradients

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=139993

            Bug ID: 139993
           Summary: Extreme lagging with SVG's containing gradients
           Product: LibreOffice
           Version: unspecified
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: LibreOffice
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: gellert.gyuris at gmail.com

Created attachment 169262
  --> https://bugs.documentfoundation.org/attachment.cgi?id=169262&action=edit
Test files for lagging with SVG gradients

I experience lagging during typing text when there is an inserted SVG.

1) No problem with other formats: I tested EMF, EPS, JPG, PNG, WMF, ODG, not
event with PDF.

2) As I researched the cause of the bug I found that it occurs when there is
gradient in the SVG.

3) Affected versions:
- LibreOffice 6.4.7.2: There is no problem with real graphics, but with
prepared SVG I can cause the lagging.
- LibreOffice 7.0.3.1; 7.0.4.2, 7.1.0.2; 7.2.0.0α: All are affected with real
graphics and there is an extreme lagging with prepared SVGs.

Step to reproduce:
- Open a new document
- Insert > Insert image... chose one attached SVG file.
- Start typing some text after inserted image. The characters appear very
slowly with lagging and they usually appear at the same time with a small or
big delay depending on how many gradient there is in SVG.

Test files:
Real graphics:
- LibreOffice logo.svg: No noticeable lagging with 6.4, but the lagging is
experienced with 7.0+.
- Ghostscript_Tiger.svg: Same as above.
Prepared SVG's for testing this bug:
- svg_objects.svg (There is no gradient, only transparency): No problem.
- svg_many_objects.svg (Lot of object without gradients): No problem.
- svg_many_objects_with_gradient (Only a few gradients): Lagging in all
versions.
- svg_many_objects_with_gradient.svg (Lot of object with gradients): Extreme
lagging, especially in 7.0+


I tested on Linux (Ubuntu 20.10, XOrg).

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