https://bugs.kde.org/show_bug.cgi?id=466982
Bug ID: 466982
Summary: Merely having some large files open, sitting there
doing nothing, causes Xorg to consume a lot of CPU
Classification: Applications
Product: kate
Version: 22.12.2
Platform: Manjaro
OS: Linux
Status: REPORTED
Severity: major
Priority: NOR
Component: application
Assignee: kwrite-bugs-n...@kde.org
Reporter: php4...@gmail.com
Target Milestone: ---
SUMMARY
STEPS TO REPRODUCE
1. I opened two arguably large files (200K lines each) in Kate in two tabs
2. (probably irrelevant: at some point I copied the contents of each and pasted
them somewhere else)
3. I left the two files open in kate, sitting there doing nothing with them.
Most of the time I wasn't even using Kate. From time to time I would be editing
other files in kate in other tabs (in the same window), never giving focus to
the two tabs where the large files were opened.
OBSERVED RESULT
For several hours continuously, probably since the moment I opened the two
files, to when I closed them, the Xorg process was consuming 30% CPU all the
time.
For many hours It didn't even cross my mind that it could be Kate.
EXPECTED RESULT
Having a file open in an unfocused tab doing absolutely nothing, no matter how
big the file, should have absolutely zero impact on CPU consumption. With
syntax highlight, I can expect some sluggishness when I'm actually modifying
the contents of the file (not even when scrolling), or I don't know, maybe
searching. But definitely not when the problematic file is not even in the
currently focused tab.
SOFTWARE/OS VERSIONS
Operating System: Manjaro Linux
KDE Plasma Version: 5.26.5
KDE Frameworks Version: 5.103.0
Qt Version: 5.15.8
Kernel Version: 6.0.19-3-MANJARO (64-bit)
Graphics Platform: X11
Processors: 8 × Intel® Core™ i7-1065G7 CPU @ 1.30GHz
Memory: 7.3 GiB of RAM
Graphics Processor: Mesa Intel® Iris® Plus Graphics
Manufacturer: LENOVO
Product Name: 81WE
System Version: IdeaPad 3 15IIL05
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