While typing a new e-mail, or a reply, there is a very noticeable and very annoying delay between pressing a key on the keyboard and it showing up on the screen.. I type upwards of 100wpm so I can easily get ahead, and have to stop and wait for it to catch up. I read some other posts, I restarted Windows in safe mode, and did the same the thunderbird, and the problem goes away. Windows 10 (64bit) , and Thunderbird, 60.5.0 (32-bit)