After another minor version upgrade, it was fast again. Upon switching to a new folder, it became slow, and remained slow.
I managed to capture 2 profiles, where you can see fast vs slow, same instance of Thunderbird, only difference is having switched to another mail folder then back to the original one.
After another minor version upgrade, it was fast again. Upon switching to a new folder, it became slow, and remained slow.
I managed to capture 2 profiles, where you can see fast vs slow, same instance of Thunderbird, only difference is having switched to another mail folder then back to the original one.
fast: /share. firefox. dev/3NPoVnU
https:/
slow: /share. firefox. dev/3PZLCbH
https:/
Maybe this means something to someone, but to me it doesn't even seem to be related to WebRender.