[Bug 272038] New: Vim scroll speed is slow and jerky in Konsole.

[m***@public.gmane.org]

https://bugs.kde.org/show_bug.cgi?id=272038

Summary: Vim scroll speed is slow and jerky in Konsole.
Product: konsole
Version: unspecified
Platform: Ubuntu Packages
OS/Version: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: general
AssignedTo: konsole-devel-***@public.gmane.org
ReportedBy: mindentropy-***@public.gmane.org


Version: unspecified (using KDE 4.6.2)
OS: Linux

A medium(606 lines) to long file scroll is very slow and jerky in Vim. The cpu
utilization is also quite high. General scroll speed in a console application
in Konsole is slow.
The expected behavior should be similar to xterm. Vim scroll speed in xterm is
very nice and its a pleasure to program in it.

Reproducible: Always

Steps to Reproduce:
Open a file which has ~1000 lines.
Scroll up and down to notice the behavior.
You can check the CPU utilization jump abnormally when scrolling.

Actual Results:
The scroll is jerky and slow.

Expected Results:
The scroll should be smooth similar to the behavior of xterm.

[m***@public.gmane.org]

https://bugs.kde.org/show_bug.cgi?id=272038





--- Comment #1 from <mindentropy gmail com> 2011-05-04 18:50:01 ---
I setup xterm to show truetype fonts and it too was terrible with vim scroll
:(. What can be done to optimize this?

[Robert Knight]

https://bugs.kde.org/show_bug.cgi?id=272038


Robert Knight <robertknight-***@public.gmane.org> changed:

What |Removed |Added
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CC| |robertknight-***@public.gmane.org




--- Comment #2 from Robert Knight <robertknight gmail com> 2011-05-09 23:03:19 ---
What font are you using? If you are not using the standard system 'monospace'
font, does the problem also exist with that?

You may wish to try running Konsole with:

konsole -graphicssystem raster

[m***@public.gmane.org]

https://bugs.kde.org/show_bug.cgi?id=272038





--- Comment #3 from <mindentropy gmail com> 2011-05-10 20:05:12 ---
Yes with the different font. -graphicssystem raster does not help. Actually
mrxvt works like a charm with monospace and Bitstream Vera Sans Mono. What
would be the difference between i.e. specific to scroll speed optimization?

[Jekyll Wu]

https://bugs.kde.org/show_bug.cgi?id=272038


Jekyll Wu <adaptee-***@public.gmane.org> changed:

What |Removed |Added
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CC| |adaptee-***@public.gmane.org




--- Comment #4 from Jekyll Wu <adaptee gmail com> 2011-09-19 21:14:40 ---
My observation is konsole does eat more cpu than xterm/rxvt-unicode when
scrolling in vim, but the user experience is almost the same. The scrolling
speed is fast and smooth, at least for me.

[Jekyll Wu]

https://bugs.kde.org/show_bug.cgi?id=272038


Jekyll Wu <adaptee-***@public.gmane.org> changed:

What |Removed |Added
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Status|UNCONFIRMED |RESOLVED
Resolution| |WORKSFORME

[Grissiom]

https://bugs.kde.org/show_bug.cgi?id=272038

Grissiom <chaos.proton-***@public.gmane.org> changed:

What |Removed |Added
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CC| |chaos.proton-***@public.gmane.org

--- Comment #5 from Grissiom <chaos.proton-***@public.gmane.org> ---
Sorry to post to an old thread but I've encountered the same issue(vim
scrolling jerky) in Konsole 2.11(KDE 4.11). I've fixed the issue with launching
Konsole with:

konsole -graphicssystem native

Whether the KWin use raster or native, I have to force Konsole use the "native"
graphic to get the performance. My distro is OpenSUSE 12.3.

BTW. is there any way to configure the Konsole to use native graphic system
instead of typing the whole long command in the launcher?