Scrolling multi-page (pages on a row) with a lot of images is slow
Steps to Reproduce:
1. Open the attached file
2. Go to multi-page view (zoom out to get at least 3 pages on a row; sidebar isn't needed)
3. Scrolling up an down (by clicking the vertical scroll-bar an moving it up and down
Fast like 22.214.171.124
User Profile Reset: No
Build ID: c24c32bf71b8e64bd0d36e511f554e1f6c015842
CPU threads: 4; OS: Windows 6.3; UI render: default;
TinderBox: Win-x86@42, Branch:master, Time: 2017-11-22_23:15:41
Locale: nl-NL (nl_NL); Calc: group threaded
and in 5.2
User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:52.0) Gecko/20100101 Firefox/52.0
Created attachment 137984 [details]
Created attachment 137985 [details]
Author: Matúš Kukan <email@example.com>
AuthorDate: Tue Jul 15 21:54:58 2014 +0200
Commit: Matúš Kukan <firstname.lastname@example.org>
CommitDate: Tue Jul 15 21:59:17 2014 +0200
libreofficekit does not work with libmerged
I can confirm this bug, it happens for me too. It looks like it could be an issue with rendering the images, because it only lags when scrolling to parts of the document that haven't yet been viewed.
While scrolling, it seems that libreoffice is using up approx. 50% of the processing power on a core, more than the usual amount. It isn't hitting max. frequency at all, so I don't think putting too much work into one thread is the issue.
Version: 126.96.36.199 (x64)
Build ID: ea7cb86e6eeb2bf3a5af73a8f7777ac570321527
CPU threads: 8; OS: Windows 6.19; UI render: GL;
Locale: en-US (en_US); Calc: group
(In reply to Thomas Woltjer from comment #3)
> I can confirm this bug, it happens for me too. It looks like it could be an
> issue with rendering the images, because it only lags when scrolling to
> parts of the document that haven't yet been viewed.
Hmm.. I wasn't to specific; sorry. This wasn't exactly about the initial lag (I 0accepted it as a fact), but the lag even after all image are viewed..
Most noticeable when moving the vertical scroll-bar from top to bottom at once or when fast scrolling (after all images are viewed at the first place)
There are some image-slow-scrolling issues reported, e.g. https://bugs.documentfoundation.org/buglist.cgi?component=Writer&f1=short_desc&list_id=754104&o1=notsubstring&product=LibreOffice&query_format=advanced&resolution=---&resolution=FIXED&resolution=INVALID&resolution=WONTFIX&resolution=DUPLICATE&resolution=WORKSFORME&resolution=MOVED&resolution=NOTABUG&resolution=NOTOURBUG&resolution=INSUFFICIENTDATA&short_desc=slow%20image&short_desc_type=allwordssubstr&v1=svg
Is one of them related to this bug?
Seems that in the 4.x release cycles some changes were made that slow down image rendering.
* For the initial scrolling lag, probably.
* For the lag after all images are loaded. The lag started after enabling tiled rendering. (https://www.ahunt.org/2014/05/tiled-rendering-with-libreofficekit/. it's introduced in 4.3. But it's probably related to the 4.2 changes..
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