Describe the bug
Generating charts for my inbox seem to take a very long time (I have yet to see the charts actually display). Have waited for charts to appear, assuming it is because of my large inbox. But have waited for likely an hour with the tab open at this point and still no charts. The spinner is spinning so I assume something is happening, but I'm not sure if I should continue to wait or if it's a bug,

To Reproduce

1. I click on the button to display the stats dashboard.
2. The top-line stats display, such as: Mails total, Mails unread, Mails received, etc
3. None of the charts display information. Just black where the charts should show up, the titles however are there.

Expected behavior
Expected the charts to appear and update as more information was processed, or the charts to show up faster.

Screenshots

System (please complete the following information):

• OS: elementaryOS 5.1.7
• Thunderbird Version 78.3.1 (64-bit)