[Bug 361843] Re: Kile 2.1 LaTeX editor is extremely slow

Tue Jan 6 15:47:22 UTC 2015

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On 2008-09-15T10:46:30+00:00 Adymo wrote:

Version:            (using Devel)
Installed from:    Compiled sources

The long text line when word wrapped in kate/kwrite makes everything
(like cursor movement, text insertion, etc.) slow. The callgrind profile
(attached) suggests that it's because line repaining takes most of the
CPU time.

To reproduce, open any file with a long line which would wrap onto 30-40
"view" lines.

What's interesting is that when you move cursor towards the end of the
long line, repainting becomes a little bit faster.

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https://bugs.launchpad.net/ubuntu/+source/kile/+bug/361843/comments/0

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On 2008-09-15T10:47:39+00:00 Adymo wrote:

Created attachment 27425
The test file where cursor movement is slow because of repainting

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https://bugs.launchpad.net/ubuntu/+source/kile/+bug/361843/comments/1

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On 2008-09-15T10:49:03+00:00 Adymo wrote:

Created attachment 27426
Callgrind profile taken during up/down cursor movements in kwrite

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https://bugs.launchpad.net/ubuntu/+source/kile/+bug/361843/comments/2

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On 2008-09-15T11:53:42+00:00 Andreas Pakulat wrote:

I think kate devs already dealt with the "problem" here:
http://bugs.kde.org/show_bug.cgi?id=169549

I'm not sure and haven't looked at your data, hence not closing it as
duplicate yet.

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https://bugs.launchpad.net/ubuntu/+source/kile/+bug/361843/comments/3

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On 2008-09-15T13:44:24+00:00 Adymo wrote:

Yeah, looks like the same problem, but slowdown is tangible even with
5-10 wrapped lines. I don't know if that can be improved though.

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https://bugs.launchpad.net/ubuntu/+source/kile/+bug/361843/comments/4

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On 2008-09-16T01:31:49+00:00 Rodda wrote:

I'm aware of these issues and plan to look into them; we may need to
switch to having multiple QTextLayouts per dynamically wrapped line :(

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https://bugs.launchpad.net/ubuntu/+source/kile/+bug/361843/comments/5

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On 2008-10-11T22:05:02+00:00 Adymo wrote:

As it turns out, to really see the problem, you should be running a
NVidia card and using the proprietary driver. On a system with an ATI
card (also proprietary driver) you can see the problem, but kate and
kwrite are perfectly usable. With nvidia, you can't work with wrapped
lines at all.

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https://bugs.launchpad.net/ubuntu/+source/kile/+bug/361843/comments/6

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On 2008-11-05T21:33:37+00:00 Søren Holm wrote:

I allso have that problem. What happenend since kde3. On kde3 my nvidia
card worked perfectly.

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https://bugs.launchpad.net/ubuntu/+source/kile/+bug/361843/comments/7

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On 2008-12-11T01:35:43+00:00 Søren Holm wrote:

Is it possible to somehow make QT4 behave (from a hardware perspective)
like QT3 ?

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https://bugs.launchpad.net/ubuntu/+source/kile/+bug/361843/comments/8

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On 2009-02-08T02:30:11+00:00 Adymo wrote:

I've just upgraded to Qt 4.5 RC1 (same system with ATI proprietary
drivers). The problem is almost solved by the new Qt.

To see the slowdown, you now need to have a long line with more than
15000 characters.

When launched as "kwrite --graphicssystem raster", slowdown disappears
completely and kwrite from KDE4 behaves just like kwrite from KDE3.

Reply at: https://bugs.launchpad.net/ubuntu/+source/kile/+bug/361843/comments/9

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On 2009-02-08T02:53:39+00:00 Søren Holm wrote:

This is great news. Is 4.4.3 and 4.5 rc1 binary compatible ?

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https://bugs.launchpad.net/ubuntu/+source/kile/+bug/361843/comments/10

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On 2009-04-18T15:59:00+00:00 Cullmann-t wrote:

And therefor there will be no patches to katepart, painting text is
expensive, there is not that much room for kate to do it better, still
the line needs to be redrawn.

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https://bugs.launchpad.net/ubuntu/+source/kile/+bug/361843/comments/22

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On 2009-04-19T02:11:42+00:00 Søren Holm wrote:

still. kde4 kate is a lot slower than the kde3 version.

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https://bugs.launchpad.net/ubuntu/+source/kile/+bug/361843/comments/23

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On 2015-01-05T22:34:49+00:00 Subscriber wrote:

I realize this issue is very old, but why was this issue resolved as
invalid? The last comments do not seem to support "invalid", it seems to
me.

I found this issue searching the bug tracker because I am running into
painful slowdowns with long lines. I assume it is the same problem, but
am unsure if I should comment on this issue or open a new.

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https://bugs.launchpad.net/ubuntu/+source/kile/+bug/361843/comments/75

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On 2015-01-06T07:40:46+00:00 Søren Holm wrote:

I think this is still valid although it might be entirely QT reletated.

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https://bugs.launchpad.net/ubuntu/+source/kile/+bug/361843/comments/76

** Bug watch added: KDE Bug Tracking System #169549
   https://bugs.kde.org/show_bug.cgi?id=169549

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Title:
  Kile 2.1 LaTeX editor is extremely slow

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