https://bugs.kde.org/show_bug.cgi?id=378227
--- Comment #2 from Deepak Mittal <dpac.mitt...@gmail.com> ---
Yes pretty sure. This doesn't just happen on dialog boxes, so you may change
the "product" for this bug. This happens with every KDE application. I thought
dolphin and gwenview were generally slow, but when I moved bulk of my fonts
outside of /usr/share/fonts, everything became snappy.
Every KDE application is parsing the fonts directory, which is making the
system unusably slow.
This is first few lines from strace -C dolphin:
% time seconds usecs/call calls errors syscall
------ ----------- ----------- --------- --------- ----------------
55.31 0.000521 1 850 getdents
17.52 0.000165 0 55772 5920 stat
7.11 0.000067 0 24605 127 lstat
5.20 0.000049 0 11790 read
4.46 0.000042 0 6217 close
3.93 0.000037 0 7943 1735 open
3.61 0.000034 0 6343 1654 readlinkat
1.06 0.000010 0 11007 fstat
0.85 0.000008 0 3742 359 access
0.53 0.000005 0 2277 getrandom
0.42 0.000004 0 1277 lseek
0.00 0.000000 0 1299 write
0.00 0.000000 0 802 poll
0.00 0.000000 0 597 mmap
0.00 0.000000 0 358 mprotect
0.00 0.000000 0 111 munmap
0.00 0.000000 0 67 brk
0.00 0.000000 0 10 rt_sigaction
0.00 0.000000 0 2 rt_sigprocmask
0.00 0.000000 0 54 ioctl
0.00 0.000000 0 453 writev
0.00 0.000000 0 15 select
Bulk of the stat calls are because of the fonts in /usr/share/fonts.
I saved the strace output in /tmp/dolphin and then ran:
grep 'usr/share/fonts' /tmp/dolphin | wc -l
⏎
47834
Clearly it's a big issue and it needs to be fixed.
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