Bug 117104 - Slower document scrolling with WMF/EMF/SVM picture and OpenGL enabled (compared with OpenGL disabled)
Summary: Slower document scrolling with WMF/EMF/SVM picture and OpenGL enabled (compar...
Alias: None
Product: LibreOffice
Classification: Unclassified
Component: Writer (show other bugs)
(earliest affected) release
Hardware: All Windows (All)
: medium normal
Assignee: Not Assigned
Depends on:
Blocks: Scrolling-PageUpDown
  Show dependency treegraph
Reported: 2018-04-19 11:44 UTC by Telesto
Modified: 2020-08-28 12:57 UTC (History)
5 users (show)

See Also:
Crash report or crash signature:
Regression By:


Note You need to log in before you can comment on or make changes to this bug.
Description Telesto 2018-04-19 11:44:30 UTC
WMF/EMF/SVM scrolling isn't blazing fast without OpenGL, but getting slower with OpenGL enabled 

Steps to Reproduce:
1. Open attachment 141434 [details] (bug 117074) 
2. Scroll up and down

Actual Results:  
Laggy scrolling

Expected Results:
Something similar as without OpenGL (or even better)

Reproducible: Always

User Profile Reset: No

OpenGL enabled: Yes

Additional Info:
Found in
Build ID: 9c4eaa7b81a40d97fe49b85272b40bfeaaf44f86
CPU threads: 4; OS: Windows 6.3; UI render: GL; 
TinderBox: Win-x86@42, Branch:master, Time: 2018-04-16_03:31:36
Locale: nl-NL (nl_NL); Calc: CL

and in
Build ID: f3153a8b245191196a4b6b9abd1d0da16eead600
Locale: nl_NL

User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:52.0) Gecko/20100101 Firefox/52.0
Comment 1 Xisco Faulí 2018-05-30 09:45:00 UTC
I can't reproduce it in

Build ID: 8d42de21c10bfefeaffabc5c939e7830a09f7dca
CPU threads: 8; OS: Mac OS X 10.13.3; UI render: GL; 
TinderBox: MacOSX-x86_64@49-TDF, Branch:master, Time: 2018-05-24_03:38:39
Locale: en-US (en_ES.UTF-8); Calc: group
Comment 2 Telesto 2018-05-30 10:49:11 UTC
Setting this to Windows for now, based on comment 1
Comment 3 Xisco Faulí 2018-11-27 20:26:15 UTC Comment hidden (obsolete)
Comment 4 Xisco Faulí 2019-01-23 15:30:23 UTC Comment hidden (obsolete)
Comment 5 QA Administrators 2019-07-30 03:18:54 UTC Comment hidden (obsolete)
Comment 6 Telesto 2019-08-05 18:38:32 UTC
Repro with
Version: (x86)
Build ID: a675fe37abc134cc5cbf54385ca99c8d1417ce2b
CPU threads: 4; OS: Windows 6.3; UI render: GL; VCL: win; 
TinderBox: Win-x86@42, Branch:master, Time: 2019-07-26_09:09:34
Locale: nl-NL (nl_NL); UI-Language: en-US
Calc: CL
Comment 7 Dieter 2019-11-11 13:30:13 UTC
Difference is not so much, but scrolling is slower with OpenGL enabled, especially using the mouse-wheel.

Version: (x64)
Build ID: cc57df8f942f239d29cb575ea5a7cb01405db787
CPU threads: 4; OS: Windows 10.0 Build 18362; UI render: GL; VCL: win; 
Locale: de-DE (de_DE); UI-Language: en-US
Calc: threaded

Beside that scrolling in this 4-page-document is very slow.
Comment 8 Buovjaga 2020-08-28 12:57:49 UTC
As Skia with Vulkan will replace OpenGL UI rendering on all platforms, it does not make sense to keep OpenGL UI reports open.

Details about Skia: https://www.collaboraoffice.com/success-story/implementing-vulkan-capable-libreoffice-user-interface-using-the-skia-library/