Like the title says. It never happens when just browsing, but happens very frequently (like a minute after starting to type) when editing text, at least on Brutaldon, but maybe on other sites too.
I noticed that our Harfbuzz package is two entire major releases behind. Maybe there are bugfixes in the latest one that we could use? I tried building it but it froze up my laptop for some reason (rather strange, even if it runs out of memory it should just be killed by earlyoom) so I haven't attempted to test this theory yet. Is there any particular reason Harfbuzz wasn't covered by the last core-updates? If it turns out to be a bug in it, what would be the best way to proceed?
