Is your Thunderbird profile on local disk, or on a file share?

Program runs on my local computer, profile is on local computer, mail folder storage is on server.

Sorry, mail folder storage is on NAS drive

Anybody have any ideas? I have deleted 1000's of emails, now down to just over 5 minutes building file. This morning I checked my emails no problems, had another look 30 minutes later and "building summary file", so I timed it. 5 minutes is a PITA and a long time waiting.

HELP! I'm having same problem since TBird automatically updated software today to vers 52. Every time I open TBird I now get an error message: "Unable to open the summary file for Inbox. Perhaps there was an error on disk, or the full path is too long." and then TBird spends several minutes re-synching my company IMAP email inbox of 8000+ emails. Never ever had an issue last 3 years before the TBird 52 update, only synched the most recent mail in IMAP like a good ol server should. Thankfully I'm on highspeed broadband at home office, but I can't be doing this on an airplane wifi or tethered to my phone.

I wonder when mine updated to V52 and whether this was pivotal to my problems? Is it possible to roll back to an earlier version?

ASchaidler said

HELP! I'm having same problem since TBird automatically updated software today to vers 52. Every time I open TBird I now get an error message: "Unable to open the summary file for Inbox. Perhaps there was an error on disk, or the full path is too long." and then TBird spends several minutes re-synching my company IMAP email inbox of 8000+ emails. Never ever had an issue last 3 years before the TBird 52 update, only synched the most recent mail in IMAP like a good ol server should. Thankfully I'm on highspeed broadband at home office, but I can't be doing this on an airplane wifi or tethered to my phone.

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100td said

I wonder when mine updated to V52 and whether this was pivotal to my problems? Is it possible to roll back to an earlier version?

Pivotal to your problem is storing your mail on a NAS device. You move from a hard disk where access is measured in the GB per second to a NAS device where access is an order of magnitude slower. So of course actions which result in the reading of the entire message store are also going to be orders of magnitude slower.