I discovered that the add-on Send Later was outdated and causing incredible delays. It was upgraded and things improved. However, I was not using it and deactivated it. Since then, Thunderbird has behaved as expected.The key to finding the problem...
Using Thunderbird 102.5.1 on Windows 11. With TB idle, the CPU utilization hovers around 17% - 18%. Sometimes it is as high as 20%. I am doing absolutely nothing but watching task manager. I clicked "Write" and it took 36 seconds for the composit...
