see https://bugzilla.mozilla.org/show_bug.cgi?id=1677272

What language locale is Thunderbird? Do you have lots of fonts?

I just have English fonts in Thunderbird.

I will try the Thunderbird beta version v84.0b2 (64-bit) later.

Thanks :)

The lag issue is solved after update to 84.0b2.

Thanks for your help. :)

We have something for you to try if you are able, to get your feedback. https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/cS4TP33hS7yHdUx2l1zlyQ/runs/0/artifacts/public/build/target.dmg which is 78.5.1 plus a patch. It will display as version 78.6.0 although some places might refer to it as "Thunderbird Daily" because it is a test build. Because you currently running beta, you will need to start Thunderbird from Mac terminal using --allow-downgrade

I am install Thunderbird Daily and create a new user profile. After adding mail account and some newsgroup accounts, there is nothing show on the left panel. Its not working on my mac.

Thank you :)

If you are using version 78, Please do Help > About to get version 78.6.1, and tell us the results. Thanks.