https://bugs.kde.org/show_bug.cgi?id=390645
Bug ID: 390645
Summary: Terrible performance on long lines (10000+ characters)
Product: kate
Version: 16.08
Platform: Debian stable
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: part
Assignee: kwrite-bugs-n...@kde.org
Reporter: zeratul...@hotmail.com
Target Milestone: ---
I often need to browse around / edit / reduce minified HTML, JS, and CSS files
from websites.
Such files have the property that they can have lines that are tens of
thousands of characters long.
Kate's performance when working with such lines is terrible. For example, when
using Shift+DownArrow to select several such lines, the response time can be in
the tens of seconds per keystroke. Copying/pasting many such lines has
sometimes caused Kate to hang for minutes, and I've been forced to kill it.
Clearly, Kate is doing something that's quadratic or worse in the line length
or selection length.
There are other text editors, like JEdit, which handle such long lines
perfectly fine, so it's definitely possible.
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