Might have found it! Ran pluma on Ubuntu MATE live (18.04) and it didn't
have the problem. So, I straced pluma to see what files were being
loaded from my home directory and started methodically renaming things
one at a time. Renaming ~/.fonts.conf seems to have done the trick for
me. The contents of that file were:
<?xml version='1.0'?>
<!DOCTYPE fontconfig SYSTEM 'fonts.dtd'>
<fontconfig>
<dir>/home/REDACTED/.Fontmatrix/Activated</dir>
</fontconfig>
I also renamed ~/.Fontmatrix for good measure.
Did some searching and it seems that fontmatrix was last available back
in 14.04. I didn't have it installed anymore, but it seems like
something I might have checked out once upon a time.
Anyhow, I hope this can get back to the developers and not silently
closed. I saw a few other frustrated pluma users around the web!
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https://bugs.launchpad.net/bugs/1792817
Title:
pluma input lag (very slow)
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