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Thunderbird suddenly laggy

Making moves

Greetings! I have been using Thunderbird for the last 5-1/2 years since I came to this job.

Outlook was not installed on my computer and I like FireFox, so I installed Thunderbird.

I find it much easier to use than Outlook and like it a lot.

But ever since the last update it lags very badly. I can click Delete on an email and it will sit there for 60 seconds or more "Not Responding"

I am using a newer Windows 10 machine with plenty of RAM, which tells me it must be something with the software.