Thunderbird - Disable Hardware Acceleration
Recently, I've noticed that Thunderbird is really slow, and will quite often get stuck on showing large black areas whenever I expand the window, or try to open a message in a new window. Luckily, disabling hardware acceleration resolved the issue for me, and it seems a lot more responsive now.
For reference, I am using the onboard graphics of an Intel i5-4670K on Linux which is probably something to do with the issue. I reckon if you one is running on Windows, or with a dedicated GPU, you are probably not going to be experiencing these issues.
Click Edit > Preferences
Then search for "use hardware" until you see the following, and then uncheck the checkbox.
First published: 20th December 2021