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Bug 47726 - Impress very slow due to antialiasing
Summary: Impress very slow due to antialiasing
Alias: None
Product: LibreOffice
Classification: Unclassified
Component: Impress (show other bugs)
(earliest affected) release
Hardware: Other All
: high major
Assignee: Not Assigned
: 63439 70914 (view as bug list)
Depends on:
Reported: 2012-03-22 08:54 UTC by Roland Baudin
Modified: 2014-06-13 03:22 UTC (History)
10 users (show)

See Also:
Crash report or crash signature:

Example presentation (12.27 KB, application/vnd.oasis.opendocument.presentation)
2012-03-22 08:54 UTC, Roland Baudin
Glitches during move (167.41 KB, image/png)
2013-03-02 20:10 UTC, Arnaud Versini

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Description Roland Baudin 2012-03-22 08:54:50 UTC
Created attachment 58879 [details]
Example presentation

Moving or resizing text boxes is very slow in Impress when image antialiasing is enabled. I thought this old bug was already reported but it seems not. However, I'm not an Ubuntu user but I saw a bug report ( that deals with the same issue.

To reproduce : open the attached presentation example, and, with image antialiasing enabled in the LibreOffice options, try to move or resize the box which contains the text "Example (slow)". This operation is very slow even on a fast machine. If you disable image antialiasing in the LibreOffice options then the move / resize operation becomes very fast and usable.

I also discovered that reducing the box size around the text greatly improves the speed (with antialiasing enabled). This can be checked on the example by moving the box which contains the text "Example (fast)".

The bug appears (at least) on LibreOffice 3.4.3 and 3.5.1, on Linux (Official build with deb packages on Debian Squeeze) or Windows XP SP3 (Official build). And since I have two computers with ATI and Nvidia graphic cards, it seems to be independent of the hardware.
Comment 1 Björn Michaelsen 2012-05-01 11:23:57 UTC
Confirmed by 28 affected users downstream on launchpad.
Comment 2 voltaic 2012-09-09 02:25:05 UTC
I first became aware of this bug on LibreOffice 3.5.6 (official Arch Linux build) on two separate computers.

I also confirm the issue persists with LibreOffice 3.6.1 on Arch Linux. Disabling anti-aliasing for graphics output significantly improves move/resize performance for text and graphics boxes. With anti-aliasing enabled, move/resize is laggy and painfully slow as reported numerous times on Launchpad.

The machines I tested this on both have Intel GM45 chipsets (Core 2 with GMA graphics) with Intel xf86 drivers versions 2.20.0 through 2.20.6. Since Roland reported the issue for both AMD and NVIDIA graphics, I assume this is not graphics drivers related.
Comment 3 Arnaud Versini 2013-03-02 20:10:01 UTC
Created attachment 75800 [details]
Glitches during move
Comment 4 Arnaud Versini 2013-03-02 20:10:33 UTC
Same for me, but on one computer I've glitch during the move, and sometimes persist after. Perhaps drawing these lines is the problem

Seems Drawing is better on this than text box from Impress (not exactly same border during move).
Comment 5 Gorka Navarrete 2013-05-27 14:21:38 UTC
The problem persists in LO in Ubuntu 13.04 64-bit in a fairly modern hardware (i7, 8GB RAM).

I don't see a significant improvement after disabling AA (In Tools > Options > View > Screen font antialiasing).

Reducing the size of the box containing the text does improve a lot the speed.

In my opinion, this should be labeled as a high important bug as it creates a very bad impression on people using LO for the first time.
Comment 6 Thorsten Behrens (CIB) 2013-05-31 23:23:03 UTC
(In reply to comment #5)
> I don't see a significant improvement after disabling AA (In Tools > Options
> > View > Screen font antialiasing).
It's the other anti-aliasing, the one under "Graphics output" on the same tabpage.
Comment 7 Thorsten Behrens (CIB) 2013-06-01 00:08:04 UTC
*** Bug 63439 has been marked as a duplicate of this bug. ***
Comment 8 Joel Madero 2013-06-01 00:10:50 UTC
With 28 users over on launchpad + the report here and dupe, upping to Major - High.
Comment 9 Glutanimate 2013-10-28 15:06:49 UTC
I am experiencing similar issues when working with graphics in LibreOffice Writer. If anti-aliasing is turned on, moving graphics becomes very sluggish and unresponsive.

(observed on LO 3.6.6)
Comment 10 Maxim Monastirsky 2013-10-28 15:40:03 UTC
I can't reproduce with under Ubuntu 13.10 (64-bit).
Comment 11 justflythere 2013-11-12 01:35:12 UTC
I can reproduce this bug with running on 64-bit Linux Mint 15 (i.e. Ubuntu 13.04). 

Turning anti-aliasing off resolves the issue completely.
Comment 12 justflythere 2013-11-12 13:01:05 UTC
*** Bug 70914 has been marked as a duplicate of this bug. ***
Comment 13 justflythere 2013-11-12 13:54:48 UTC
I can reproduce what is described in bug report 70914, i.e. there is almost no lag when two text fields are selected, even with anti-aliasing turned on.

The lag disappeared for me as well when the text field was moved far from its original position.

With, 64-bit Linux Mint 15
Comment 14 Piotr Kołaczkowski 2013-11-12 19:47:50 UTC
I confirm turning off image antialiasing fixes this. Wow - it is awesome! Thanks, now it works like a charm.
Comment 15 korundrum 2014-02-17 17:29:19 UTC
This issue is FIXED in LibreOffice RC (can someone please confirm this?).

Thank you guys for your great work!
Comment 16 korundrum 2014-04-07 09:21:20 UTC
Since I was affected by this bug before and now can't reproduce it anymore in LO RC, I mark this bug as FIXED.

Please feel free to reopen it, in case you still encounter this bug in a recent LO installation.