Just dropping by to confirm: The workaround quoted in comment [#13](https://bugzilla.mozilla.org/show_bug.cgi?id=1730423#c13) works for me.
After changing the two values, Thunderbird's idle CPU usage drops below 1 % according to htop and sits (close) to 0 % frequently. When hovering over e-mails or folders, no significant increase of CPU load can be observed.
I was the author of the previously mentioned thread in the ArchLinux forum (comment [#7](https:/ /bugzilla. mozilla. org/show_ bug.cgi? id=1730423# c7) and [#14](https:/ /bugzilla. mozilla. org/show_ bug.cgi? id=1730423# c14)).
Just dropping by to confirm: The workaround quoted in comment [#13](https:/ /bugzilla. mozilla. org/show_ bug.cgi? id=1730423# c13) works for me.
After changing the two values, Thunderbird's idle CPU usage drops below 1 % according to htop and sits (close) to 0 % frequently. When hovering over e-mails or folders, no significant increase of CPU load can be observed.