Bug 62816

Summary: Very laggy konsole when lots is outputed
Product: [Applications] konsole Reporter: Simon Ejsing <simon>
Component: generalAssignee: Konsole Developer <konsole-devel>
Status: RESOLVED WORKSFORME    
Severity: normal CC: ismail
Priority: NOR    
Version: unspecified   
Target Milestone: ---   
Platform: Gentoo Packages   
OS: Linux   
Latest Commit: Version Fixed In:
Sentry Crash Report:

Description Simon Ejsing 2003-08-17 11:09:24 UTC 
Version:            (using KDE KDE 3.1.2)
Installed from:    Gentoo Packages
OS:          Linux

My konsole seems to lag extremely when most of the console area is filled with characters. I'm using Gentoo Linux, but this same behaviour was found when using Slackware too. I'm running at 1600x1200 resolution with a fullscreen Konsole, so it's quite a large amount of characters (157x52).

The lag is so extreme that changing to another konsole (in the same tab-window) takes forever and mouse events seems to be lost I have to click about 10 times at the tab to get it to change. Sometimes it can even seem to freeze my XServer for seconds at a time. Also the Konsole is generating a large amount of CPU load by itself

My suspicion is that the font is causing this problem, however I've tried every font available in Konsole, and all lags. An xterm however does _not_ lag.

To reproduce, I just do a "find" from the root.
Comment 1 Ismail Donmez 2003-08-17 11:40:44 UTC 
You dont do anti-aliasing for konsole font right?
Comment 2 Simon Ejsing 2003-08-18 12:32:53 UTC 
How do I check that? And how can I disable it if I am using it?
Comment 3 Ismail Donmez 2003-08-18 14:02:09 UTC 
anti-aliased fonts looks rounder . You can check what font you use under Konsole-
>Settings->Font only TTF/OTF fonts can be aliased. And you should be using Fixed 
PCF font.
Comment 4 Simon Ejsing 2003-08-18 14:13:35 UTC 
If I use "Terminal [Bitstream]" as font, it seems to work better. 
 
But choosing a font from Settings -> Font -> Normal through Settings -> Font -> Huge, chooses 
a font that's not available from the font list and which is lagging a lot.
Comment 5 Simon Ejsing 2003-12-12 10:43:27 UTC 
This seems to be fixed in newer version of KDE / Qt / X11