Bug 141278

Summary:	Scrolling a table big table with plenty of cells slow in single view (if visible in full) or in multi-page mode with pages next to each other
Product:	LibreOffice	Reporter:	Telesto <telesto>
Component:	Writer	Assignee:	Not Assigned <libreoffice-bugs>
Status:	RESOLVED WORKSFORME
Severity:	normal	CC:	79045_79045, l.lunak
Priority:	medium
Version:	7.2.0.0.alpha0+
Hardware:	All
OS:	All
See Also:	https://bugs.documentfoundation.org/show_bug.cgi?id=126788
Whiteboard:
Crash report or crash signature:		Regression By:
Bug Depends on:
Bug Blocks:	108075
Attachments:	Example file

Description Telesto 2021-03-27 07:27:11 UTC

Description:
Scrolling a table big table with plenty of cells slow in single view (if visible in full) or in multi-page mode with pages next to each other

Steps to Reproduce:
1. Open the attached file
2. Multipage mode, pick zoom mode where you have 2 pages in a row
3. Scroll, up down (notice the delay of scrollbar) or even better simply drag the scrollbar up down with mouse 

Actual Results:
Not as snappy as it ideally should be

Expected Results:
lags and delays


Reproducible: Always


User Profile Reset: No



Additional Info:
Version: 7.2.0.0.alpha0+ (x64) / LibreOffice Community
Build ID: dc3b64dcbfb0a49c0be65bd8d73ed4e6d3828a21
CPU threads: 4; OS: Windows 6.3 Build 9600; UI render: default; VCL: win
Locale: nl-NL (nl_NL); UI: en-US
Calc: CL

Comment 1 Telesto 2021-03-27 07:27:45 UTC

Created attachment 170779 [details]
Example file

Comment 2 Roman Kuznetsov 2021-03-30 11:21:30 UTC

There is a some delay in

Version: 7.2.0.0.alpha0+ (x64) / LibreOffice Community
Build ID: 78c33a4c3d1633b97049874305b3b49b820395a2
CPU threads: 4; OS: Windows 10.0 Build 18363; UI render: default; VCL: win
Locale: ru-RU (ru_RU); UI: en-US
Calc: threaded

and even worse with Skia =(

Version: 7.2.0.0.alpha0+ (x64) / LibreOffice Community
Build ID: 78c33a4c3d1633b97049874305b3b49b820395a2
CPU threads: 4; OS: Windows 10.0 Build 18363; UI render: Skia/Raster; VCL: win
Locale: ru-RU (ru_RU); UI: en-US
Calc: threaded

Comment 3 Luboš Luňák 2021-04-07 17:53:15 UTC

With current master, which has some changes that might be relevant, I cannot see a noticeable difference with Skia compared to non-Skia => not Skia-specific.
And regardless of the backend I find the performance adequate, given that the table has 20000 cells, so unless the document is next to unusable, this is as good as it gets.