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'''This article is not just about performance issues.''' Antivirus software can also [[Thunderbird:Testing:Antivirus_Related_Performance_Issues#symptomsSymptoms|cause odd behavior (bad, incorrect or unusual), and crashes (random or consistent, infrequent or frequent)]].
<br>Much of the information below is comes from users like you.
<br>If you have a problem that is not listed here, please add it to the list so other users can benifit. (create a wiki account, and click "edit")
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= Symptoms =
Possible behaviors:
* Mild to severe slownessin compose or message operations* Slow delete, archive or move of messages
* Not able to get new mail
* OS hangs or crashes
... while doing the following:
* Starting Thunderbird
* Selecting a different folder
* Opening / displaying a message
* Moving Deleting or archiving messages, or moving messages to a different folder * Replying to a message / Sending a message/ Compose
* Downloading or attempting to get new messages (receiving mail)
* Initial mailbox indexing for global search
* Opening file attachments
= My Problem Cannot be Caused by Antivirus =
... because: 1) My Antivirus software has been working greatand hasn't changed. 2) Thunderbird has been working great and hasn't changed. 3) Thunderbird is the only program that is affected. 4) I even tried disabling my antivirus software.
{{Warning|Your antivirus software has probably worked great for months or years, across many previous versions of Thunderbird. But this is NO guarantee it is working correctly now. Antivirus and Thunderbird have a complex relationship, and that relationship can be broken by updates or version changes of <u>either</u> softwareat any time. Yes even if Thunderbird is the only software affected, even if your AV version did not change. AV vendors don't always play nice, and don't always adapt their software to new versions of other software on your computer, whether . Whether you know it or not they do make accommodations under the hood for in how they interact with other software. In short, if TB performance is good when AV software has been disabled, doesn't make this fundamentally a bug in Thunderbird, although there are certainly areas of Thunderbird performance that can be improved.}}
= First Steps =
'''A quick test of the impact of antivirus software (AV) is start your OS in safe mode: [http://bit.ly/1MU6eMa starting Windows in safe mode], or [https://support.apple.com/en-us/HT201262 starting Mac in safe mode].''' If your problem is gone with the operating system in safe mode, then the cause can be antivirus or some other software loading during the OS startup.
* '''*NOTE, testing by disabling antivirus using AV settings has proven over the years to not be a perfect or sufficient test, because sometimes changing AV setting changes are is not effective. Therefore the The only perfect test is OS in safe mode.'''
* '''If you determine AV to be a problem, then you must either disable the AV feature affecting Thunderbird (typically by excluding the Thunderbird profile), or change to a different AV program.'''
** '''If you have altered Thunderbird to put your profile account data in a nonstandard file location then you MUST set your antivirus software to exclude these nonstandard locations.'''
* Note also - run only '''one''' antivirus, '''one''' firewall, '''one''' malware (never multiples of each - more is not better)
= Testing Suggests My Problem is Caused by Antivirus Software =
If OS safe mode or other adjustments suggest that antivirus may be causing your problem, you have the following choices:
* Adjust the exclusions in the antivirus software settings to stop the problem. '''%%'''
* Turn off features in antivirus software that are not absolutely necessary. '''%%''' Some features are included to make the vendor look good against their compeitioncompetition, but don't actually make you much safer.
* Inform the antivirus vendor, and be persistent in getting past a canned response that their software is not at fault.
* Find a different antivirus software or vendor that offers more reliable service.
