Thunderbird slow downloading/opening email
Specs: TB 115.14.0 Win 10 22H2 Windows Defender FIOS internet Gmail accounts via POP3
Starting a couple of TB updates back, my system has been slow downloading and opening emails from gmail accounts via POP3. When I check for new messages, it starts downloading instantly, but then there can be a pause with the Windows hourglass shown for ~5-10 sec before downloading resumes.
When I click a new email in any of my inboxes, it opens a fully formatted TB page with the To/From/Subject all shown correctly, but the message content area is blank white. May take up to ~10 sec to display the message content. Doesn't matter if the content is plain text or includes images or with/without attachments. Same thing can happen with emails previously received and read.
Don't think this is an ISP issue because Firefox 129.0 isn't having delays opening web pages.
No errors reported by: chkdsk /r on both boot SSD and internal data HDD DISM.exe /Online /Cleanup-image /Restorehealth sfc /scannow
Any suggestions? Thanks!