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Takes forever to load when starting up for the day. Why?

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Thunderbird appears to open within 30 seconds or so, showing the inbox messages of the previous day, but is unresponsive for 5 or 10 minutes or more before it finally displays the messages received since the last session and will open one of those when you click on it.

Thunderbird appears to open within 30 seconds or so, showing the inbox messages of the previous day, but is unresponsive for 5 or 10 minutes or more before it finally displays the messages received since the last session and will open one of those when you click on it.

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Same here.

Moreover, when I reply to a message in my inbox or when I forward it, it also takes forever (sometimes 5 minutes) even though the message may be just a short line of text.

However, when I create a new message, it gets sent out immediately.

Error message: MsgComposeCommands.js:465

I keep my inbox clean, empty, and compact often. Antivirus program doesn't check outgoing messages.