perhaps you can file a bug about it? should not be that slow. here are a few of the places where it's being deleted by the looks of things: https://searchfox.

perhaps you can file a bug about it? should not be that slow. here are a few of the places where it's being deleted by the looks of things: https://searchfox.org/mozilla-central/search?q=history+delete&path= https://searchfox.org/mozilla-central/search?q=history+delet... it's in javascript so it could be debugged with an artifact build perhaps?