Bug 61350 - Page separator line is slowing down page scrolling
Summary: Page separator line is slowing down page scrolling
Status: NEW
Alias: None
Product: LibreOffice
Classification: Unclassified
Component: Writer (show other bugs)
(earliest affected) release
Hardware: x86 (IA32) Windows (All)
: low minor
Assignee: Not Assigned
Depends on:
Blocks: Scrolling-Performance
  Show dependency treegraph
Reported: 2013-02-23 14:54 UTC by josiasmat
Modified: 2021-12-05 15:41 UTC (History)
4 users (show)

See Also:
Crash report or crash signature:

Sample document with some page breaks. (100.12 KB, application/vnd.oasis.opendocument.text)
2013-09-27 18:41 UTC, josiasmat

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Description josiasmat 2013-02-23 14:54:46 UTC
The dashed line between pages is slowing down page scrolling.

Steps to reproduce:
1. Open a multi-page document, 
   Or create a new document and put some page breaks;
2. Scroll down or up (with mouse or scroll bar).
3. Note that the scrolling is slowed down when the dashed line appears in the visible area.

Reproduced on LibreOffice, running on Windows 7 x86-64.

PS.: sorry for my bad english.
Comment 1 Brenda Granados 2013-02-24 14:00:54 UTC
Hi, I cannot confirm this. I tested using LibreOffice 4.0 and on Windows 8. I created a new 8 page text document, and used Insert -> Manual Break to insert a page break between a few paragraphs. I scrolled up and down, using the mouse and scroll bar. 

Do the documents you have issues with contain any graphics, tables, or other elements? Are they much longer than 8 pages? If you have extra info, please comment here, and change status back to Unconfirmed.
Comment 2 josiasmat 2013-02-24 14:24:34 UTC
Hi, thank you for the reply. Maybe my computer is too slow, it is an Ultrabook with a Sandy Brige Core i3 and 6Gb of RAM. Maybe it occurs only with Windows 7, maybe only with the 64-bits version of Windows (maybe because LibreOffice is compiled for 32-bits). But I tested both with a blank document (only with page breaks) and with text and images, and in both cases the dashed line makes the scrolling to be sluggish.
Comment 3 Brenda Granados 2013-02-25 20:22:49 UTC
I have 64 bit Windows 8, but I have 8Gb ram. That could be the problem, but I can't say for sure. I also tested with Ubuntu 12.04 and experienced no issues. I am going to reset the status to UNCONFIRMED for now.
Comment 4 Joel Madero 2013-02-26 18:27:42 UTC
josiasmat - can you provide a document that you see this problem? This sounds very familiar and might be a duplicate of a bug I've already confirmed -- unfortunately I can't find that bug :-/
Comment 5 Joel Madero 2013-04-14 21:33:55 UTC
Marking as needinfo, please attach a document that you see the problem and mark as UNCONFIRMED. 


P.S. It's not a slow machine problem - many of us have much slower machines, if you attach a document and I can confirm, it's indeed a bug (like I said, almost positive it's a duplicate of another one)
Comment 6 josiasmat 2013-09-27 18:41:41 UTC
Created attachment 86738 [details]
Sample document with some page breaks.
Comment 7 josiasmat 2013-09-27 18:44:21 UTC
Attached a sample document with some page breaks.
Notice that, when you reach the page breaks (indicated by a horizontal dashed line), the scrolling appears sluggish.
Evidently, it is a somewhat subjective impression, and depends also on the speed of the computer, but the effect is there (at least for me).

Confirmed on LibreOffice on Windows 8 x64, running on a Core i7-3537U w/ 8GB RAM.
Comment 8 josiasmat 2013-09-27 19:07:28 UTC
I just realized that if you uncheck the "Use Anti-Aliasing" option in Tools > Options > View, the problem apparently disappears, or at least it becomes imperceptible (maybe not in a slower computer).
Comment 9 Brenda Granados 2013-09-28 19:19:39 UTC
Hi! Thanks for providing a test document. I cannot confirm this using LibreOffice Writer Version: on Ubuntu Linux 13.04 x64, but it could be something to do with Windows. Putting this bug in UNCONFIRMED state for now.
Comment 10 josiasmat 2013-09-28 20:28:55 UTC
I tested using two virtual machines, one with Linux Mint 14 and another with Windows XP. Neither of these had the issue I described initially. I even thought that LibreOffice running inside a VM could show the issue more proeminently. Apparently, it's a issue that occurs only on Windows 7 and 8 (maybe Vista).
Comment 11 ign_christian 2013-09-29 01:17:54 UTC
I can't confirm that with LO (Win7 32bit), both 'Anti-aliasing' & 'Hardware acceleration' enabled. (perhaps there is a little bit lag in the page break but I can't really feel that :))
Comment 12 tommy27 2014-02-18 20:23:40 UTC
(In reply to comment #10)
> ... Apparently, it's a issue that occurs only on Windows 7 and 8
> (maybe Vista).

not reproducible with under Win7 64bit.

do you still see it with current LibO releases?
Comment 13 immanuelg 2014-07-26 22:00:32 UTC
Reproduced on:

Opened attached sample file and hold "pg dn" all the way down, and it didn't go straight down, it has pauses.
I then held "pg up" all the way up, and again, it didn't go straight.
Comment 14 QA Administrators 2015-09-04 02:48:38 UTC Comment hidden (obsolete)
Comment 15 tommy27 2015-09-06 12:16:25 UTC
(In reply to immanuelg from comment #13)
> Reproduced on:
> Win7x64,
> Opened attached sample file and hold "pg dn" all the way down, and it didn't
> go straight down, it has pauses.
> I then held "pg up" all the way up, and again, it didn't go straight.

Ok, I see that very brief pause when page breaks are encountered in LibO 4.4.5

however it doesn't seems to me a very important issue so I'm lowering priority
that pause is barely visible on my PC.
Comment 16 QA Administrators 2016-09-20 10:29:41 UTC Comment hidden (obsolete)
Comment 17 Anass Ahmed 2016-11-19 12:12:49 UTC
I've noticed this issue every once in a while (maybe on Windows computers).

Our company template uses shapes in Headers and Footers. Can this bug be related to Bug 87485?
Comment 18 David 2017-02-21 17:42:27 UTC
This is still a significant problem on version 5.3 under Linux.
Comment 19 David 2017-05-25 10:56:09 UTC
The problem is most apparent to me when using the scroll wheel on the mouse, which is usually how I scroll.
Comment 20 David 2017-10-06 15:10:36 UTC
I think this may be fixed with version 5.4.2.  The scrolling seems smooth, and I'm not seeing artifacts left by the page splits either.
Comment 21 QA Administrators 2018-10-07 03:06:02 UTC Comment hidden (obsolete)
Comment 22 Fred Olness 2019-02-07 16:48:00 UTC
This appears to be connected to turning on "anti-aliasing" in Writer. 

I am experiencing this problem in Ubuntu (16.04) Linux under Version:
If I disable "anti-aliasing" this problem goes away. 

I also tested this in Windows 10 under version and Version: (x64)
and DID NOT find this problem. 


Build ID: 1:6.1.4-0ubuntu0.16.04.1~lo2
CPU threads: 8; OS: Linux 4.4; UI render: default; VCL: gtk2; 
Locale: en-US (en_US.UTF-8); Calc: group threaded
Comment 23 QA Administrators 2021-02-07 04:18:37 UTC
Dear josiasmat,

To make sure we're focusing on the bugs that affect our users today, LibreOffice QA is asking bug reporters and confirmers to retest open, confirmed bugs which have not been touched for over a year.

There have been thousands of bug fixes and commits since anyone checked on this bug report. During that time, it's possible that the bug has been fixed, or the details of the problem have changed. We'd really appreciate your help in getting confirmation that the bug is still present.

If you have time, please do the following:

Test to see if the bug is still present with the latest version of LibreOffice from https://www.libreoffice.org/download/

If the bug is present, please leave a comment that includes the information from Help - About LibreOffice.
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Please DO NOT

Update the version field
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appropriate in this case)

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