This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Thunderbird 38.4.0 very slow to open or delete messages (5 or more seconds) CAUSE: Bitdefender AV

  • 3 cavab
  • 2 have this problem
  • 5 views
  • Last reply by Wayne Mery

more options

Thunderbird very slow to open or delete messages. Have compacted folders, emptied Junk and trash folders, no improvement. Just upgraded (about 3 hours ago) to 38.4.0

Thunderbird very slow to open or delete messages. Have compacted folders, emptied Junk and trash folders, no improvement. Just upgraded (about 3 hours ago) to 38.4.0

Modified by Wayne Mery

Chosen solution

If you have not changed anything except updating thunderbird then it's likely caused by antivirus software. see https://wiki.mozilla.org/Thunderbird:Testing:Antivirus_Related_Performance_Issues and https://wiki.mozilla.org/Thunderbird:Testing:Memory_Usage_Problems

Let us know what youf ind please

Read this answer in context 👍 0

All Replies (3)

more options

Seçilmiş Həll

If you have not changed anything except updating thunderbird then it's likely caused by antivirus software. see https://wiki.mozilla.org/Thunderbird:Testing:Antivirus_Related_Performance_Issues and https://wiki.mozilla.org/Thunderbird:Testing:Memory_Usage_Problems

Let us know what youf ind please

more options

Problem turned out to be interference from BitDefender. A little more searching found a possible help: "Uninstall and re-install BitDefender". Did that, and problem solved.

Thank you.


- Jim

more options

Jim, thanks for letting us know the cause