Thunderbird is freezing on yahoo sync & index

Syncing and indexing activity of my Yahoo mail is going at 2 mails per minute. The first 1k mails went extremely fast compared. Now its doing this while keeping my TB as Not Responding 99% of the time.

Windows 10

Thanks, I don’t know if this is the right place to ask so I apologize.

After a PC restart it went fast again. Cannot reproduce. Thank you anyways.