Bug 124321 - Sluggish scrolling and high CPU while scrolling for document with (very) large table (7183 row)
Summary: Sluggish scrolling and high CPU while scrolling for document with (very) larg...
Status: NEW
Alias: None
Product: LibreOffice
Classification: Unclassified
Component: Writer (show other bugs)
Version:
(earliest affected)
4.4.7.2 release
Hardware: All All
: medium normal
Assignee: Not Assigned
URL:
Whiteboard:
Keywords: haveBacktrace, perf
Depends on:
Blocks: Writer-Tables Scrolling-PageUpDown Scrolling-Performance
  Show dependency tree / graph
 
Reported: 2019-03-25 10:17 UTC by Telesto
Modified: 2021-12-02 18:40 UTC (History)
3 users (show)

See Also:
Crash report or crash signature:

Attachments
Example file (292.78 KB, application/vnd.oasis.opendocument.text)
2019-03-27 10:06 UTC, Telesto 		Details
Perf flamegraph (900.20 KB, image/svg+xml)
2019-04-23 16:05 UTC, Buovjaga 		Details
View All Add an attachment (proposed patch, testcase, etc.)

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Description Telesto 2019-03-25 10:17:21 UTC 
Description:
Sluggish scrolling and high CPU while scrolling for document with (very) large table

Slow file-opening is covered by bug 84635. Scrolling issue appears to be new

Steps to Reproduce:
1. Open attachment 107268 [details] (bug  84635). 
2. Scroll when the document shows up/ or wait until all background processing finished & scroll again



Actual Results:
Slow drawing & high CPU usage

Expected Results:
Smooth scrolling like 4.4.7.2


Reproducible: Always


User Profile Reset: No



Additional Info:
Version: 6.3.0.0.alpha0+
Build ID: 20ea90a557b5bc744fd234e3a20ab1db484cf88b
CPU threads: 4; OS: Windows 6.3; UI render: default; VCL: win; 
TinderBox: Win-x86@42, Branch:master, Time: 2019-03-22_03:21:58
Locale: nl-NL (nl_NL); UI-Language: en-US
Calc: threaded
Comment 1 Roman Kuznetsov 2019-03-26 23:40:32 UTC 
repro in 6.3 and in 4.4.7.2 too

but when I unzip the odt file I get error from 7-zip like "Error in headers"

may be odt file is brocken?
Comment 2 Telesto 2019-03-27 10:06:52 UTC 
Created attachment 150299 [details]
Example file

Resaved file; don't think it matters but anyway.
Comment 3 Telesto 2019-03-27 10:11:49 UTC 
(In reply to Roman Kuznetsov from comment #1)
What is the basis for the conformation. Slow file opening is covered by bug  84635 (which appears in 4.4.7.2 and 6.3.0.0).

This issue is about choppy tearing when scrolling after LibO is idling.. It's fine in 4.4.7.2 and "broken" in 6.3.0.0
Comment 4 mulla.tasanim 2019-04-03 18:20:43 UTC 
Thank you for reporting the bug.

I have observed that attached document takes time to open(1-2 min) and scrolling is sluggish.

I can confirm that the bug is present in

Version: 6.2.1.2 (x64)
Build ID: 7bcb35dc3024a62dea0caee87020152d1ee96e71
CPU threads: 4; OS: Windows 6.3; UI render: default; VCL: win; 
Locale: en-US (en_US); UI-Language: en-US
Calc: CL


Version: 6.3.0.0.alpha0+ (x64)
Build ID: 91cdf22b88a4f7bec243c8fb187627e766d3294c
CPU threads: 4; OS: Windows 6.3; UI render: default; VCL: win; 
TinderBox: Win-x86_64@42, Branch:master, Time: 2019-03-08_00:38:10
Locale: en-US (en_US); UI-Language: en-US
Calc: CL
Comment 5 Buovjaga 2019-04-23 16:05:24 UTC 
Created attachment 150956 [details]
Perf flamegraph

From scrolling

Arch Linux 64-bit
Version: 6.3.0.0.alpha0+
Build ID: b8f33d053c2cbf05872cf9ddfeff4cc302ee281f
CPU threads: 8; OS: Linux 5.0; UI render: default; VCL: gtk3; 
Locale: fi-FI (fi_FI.UTF-8); UI-Language: en-US
Calc: threaded
Built on 20 April 2019
Comment 6 Buovjaga 2019-04-23 20:05:46 UTC 
Scrolling is already sluggish in the last commit of win32-4.3. Sluggish in the first commit of win32-5.0 as well. Opening basically hangs in the last commit of win32-5.0.

Would be great, if you gave a shot at investigating the regression aspect.