Bug 125486 - Slow scrolling - tearing - with bitmap images around (with/without OpenGL)
Summary: Slow scrolling - tearing - with bitmap images around (with/without OpenGL)
Status: NEW
Alias: None
Product: LibreOffice
Classification: Unclassified
Component: Writer (show other bugs)
Version:
(earliest affected)
6.3.0.0.alpha1+
Hardware: All Windows (All)
: medium minor
Assignee: Not Assigned
URL:
Whiteboard:
Keywords: perf
Depends on:
Blocks: Scrolling-PageUpDown
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Reported: 2019-05-25 12:08 UTC by Telesto
Modified: 2022-12-04 19:18 UTC (History)
2 users (show)

See Also:
Crash report or crash signature:

Attachments
Example file (316.45 KB, application/vnd.oasis.opendocument.text)
2019-05-25 12:08 UTC, Telesto 		Details
Screencast (10.94 MB, video/mp4)
2019-06-01 11:24 UTC, Telesto 		Details
View All Add an attachment (proposed patch, testcase, etc.)

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Description Telesto 2019-05-25 12:08:30 UTC 
Description:
Slow scrolling - tearing - with bitmap images around

Steps to Reproduce:
1. Open the attached file
2. Scroll down


Actual Results:
Slow scrolling

Expected Results:
Smooth scrolling


Reproducible: Always


User Profile Reset: No



Additional Info:
Version: 6.3.0.0.alpha1+
Build ID: f5b9590fc06811a9dff550c6998d1d1088507e23
CPU threads: 4; OS: Windows 6.3; UI render: GL; VCL: win; 
Locale: nl-NL (nl_NL); UI-Language: en-US
Calc: CL
Comment 1 Telesto 2019-05-25 12:08:54 UTC 
Created attachment 151672 [details]
Example file
Comment 2 Dieter 2019-06-01 09:29:05 UTC 
I can't confirm this with touchpad or scrollbar in

Version: 6.3.0.0.alpha1+ (x64)
Build ID: e92dcfdc7bd7b237e0bee26ff226a102d9e8e766
CPU threads: 4; OS: Windows 10.0; UI render: default; VCL: win; 
TinderBox: Win-x86_64@42, Branch:master, Time: 2019-05-14_00:00:57
Locale: en-US (de_DE); UI-Language: en-US
Calc: threaded
Comment 3 Telesto 2019-06-01 11:24:03 UTC 
Created attachment 151827 [details]
Screencast

Slowdowneasiest to see when holding page up/down
Version: 6.3.0.0.alpha1+
Build ID: 63b39fe87644587210214198fb67d6b3fb3343c5
CPU threads: 4; OS: Windows 6.3; UI render: default; VCL: win; 
TinderBox: Win-x86@42, Branch:master, Time: 2019-05-27_01:42:59
Locale: it-IT (nl_NL); UI-Language: en-US
Calc: CL
Comment 4 Dieter 2019-06-01 11:47:49 UTC 
It's not a really slow scrolling, but when I use down arrow the scrollbar always jumps back. So I would confirm a bug summary "Problems with scrolling - tearing - with ..."
Comment 5 Xisco Faulí 2019-07-05 10:14:23 UTC 
it works like a charm in

Version: 6.4.0.0.alpha0+
Build ID: d62f6b7d40284b2e41831376e5388711ab6250f3
CPU threads: 4; OS: Linux 4.15; UI render: default; VCL: gtk3; 
Locale: ca-ES (ca_ES.UTF-8); UI-Language: en-US
Calc: threaded

@Telesto, Could you please try to reproduce it with a master build ?
Noel has been working on performance issues left and right...
Comment 6 Telesto 2019-07-05 11:02:57 UTC 
Scrolling speed is still inconsistent (slowdowns) especially with OpenGL enabled. 
Normal scrolling quite OK without OpenGL (however some delays are noticeable when holding page down/up)

Version: 6.4.0.0.alpha0+ (x86)
Build ID: c2cb467a1e5194c56bb65706b7965fb2c9241b8f
CPU threads: 4; OS: Windows 6.3; UI render: GL; VCL: win; 
TinderBox: Win-x86@42, Branch:master, Time: 2019-06-29_00:11:35
Locale: nl-NL (nl_NL); UI-Language: en-US
Calc: threaded
Comment 7 Buovjaga 2019-07-24 11:44:29 UTC 
I confirm the slowness also without OpenGL.

Version: 6.4.0.0.alpha0+ (x64)
Build ID: 1ba34e905f717f15afabb514d9740d53c85e4af4
CPU threads: 4; OS: Windows 10.0; UI render: GL; VCL: win; 
TinderBox: Win-x86_64@42, Branch:master, Time: 2019-07-23_23:19:37
Locale: fi-FI (fi_FI); UI-Language: en-US
Calc: threaded
Comment 8 Buovjaga 2022-12-04 19:18:49 UTC 
Still repro the slight slowdowns when scrolling past the pages with bitmaps

Version: 7.5.0.0.alpha1+ (X86_64) / LibreOffice Community
Build ID: ce60a3dd4dbff0dcb5b82c9053ae5d90f8ac929d
CPU threads: 2; OS: Windows 10.0 Build 19044; UI render: Skia/Raster; VCL: win
Locale: fi-FI (fi_FI); UI: en-US
Calc: threaded Jumbo