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Bug 116630 - High CPU usage (25%) scrolling a slide down with arrow key containing a table
Summary: High CPU usage (25%) scrolling a slide down with arrow key containing a table
Status: NEW
Alias: None
Product: LibreOffice
Classification: Unclassified
Component: Impress (show other bugs)
(earliest affected) release
Hardware: All Windows (All)
: medium normal
Assignee: Not Assigned
Keywords: bibisected, bisected, needsDevAdvice
Depends on:
Blocks: DirectWrite-Regression
  Show dependency treegraph
Reported: 2018-03-25 21:02 UTC by Telesto
Modified: 2019-12-02 16:11 UTC (History)
3 users (show)

See Also:
Crash report or crash signature:

Example file (38.97 KB, application/vnd.oasis.opendocument.presentation)
2018-03-25 21:04 UTC, Telesto
Bibisect log (2.91 KB, text/plain)
2018-03-25 21:11 UTC, Telesto

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Description Telesto 2018-03-25 21:02:30 UTC
Using 1 core scrolling a slide down with arrow key

Steps to Reproduce:
1. Open the attached file (based on bug 113643)
2. Scroll the slide to top position
3. Scroll down using the down arrow key

Actual Results:  
Utilization of 1 core & a small lag

Expected Results:
12% or less

Reproducible: Always

User Profile Reset: No

Additional Info:
Found in
Build ID: dd4f1b1bd31daf080dc0420524712dc244e539b5
CPU threads: 4; OS: Windows 6.3; UI render: default; 
TinderBox: Win-x86@42, Branch:master, Time: 2018-03-20_23:26:38
Locale: nl-NL (nl_NL); Calc: CL

User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:52.0) Gecko/20100101 Firefox/52.0
Comment 1 Telesto 2018-03-25 21:04:55 UTC
Created attachment 140880 [details]
Example file
Comment 2 Telesto 2018-03-25 21:11:27 UTC
Created attachment 140881 [details]
Bibisect log

Bisected to:
author	Khaled Hosny <>	2017-03-03 05:15:14 +0200
committer	Khaled Hosny <>	2017-03-03 13:22:53 +0000
commit	a51b7a1c3a7e7cf7b0c733e1dec40288278c1884 (patch)
tree	6452088195b6c0ad617e7a6b9f97ecc8672d321e
parent	5742868ccf030b2c0f03538d030bd18bd5666bdb (diff)
tdf#103831, tdf#100986: Force using GDI when needed
Our DirectWrite renderer is incomplete and can’t handle rotated text or text
with horizontal scaling, so route these two through GDI for now.
Comment 3 Buovjaga 2018-03-29 14:17:19 UTC
Don't know, if we should just dupe to bug 107521 ...?
Comment 4 Telesto 2018-03-29 20:07:45 UTC
(In reply to Buovjaga from comment #3)
> Don't know, if we should just dupe to bug 107521 ...?

It's a bit to complex for me.  A commit partly reverted again because of all sorts of performance issues (See (meta) bug 112486

The problem is still exists in LibO6.1, so must another part of same commit. Or related to bug 108608..
Comment 5 Roman Kuznetsov 2019-11-27 14:50:08 UTC
Why isn't it a NEW? I can confirm it in:

Версия: (x64)
ID сборки: 685a0c2de4e12cde691ebff63b0f2348a7d68b58
Потоков ЦП: 4; ОС:Windows 10.0 Build 18362; Отрисовка ИП: по умолчанию; VCL: win; 
Локаль: ru-RU (ru_RU); Язык интерфейса: ru-RU
Calc: threaded
Comment 6 Buovjaga 2019-11-27 15:12:13 UTC
(In reply to Roman Kuznetsov from comment #5)
> Why isn't it a NEW? I can confirm it in:

Because keyword: needsDevAdvice