Canmove, confirm
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ESET and bitdefender problems
*[[Thunderbird:Testing:Antivirus_Related_Performance_Issues#AVG|AVG]]
* Avira antivirus [http://forums.mozillazine.org/viewtopic.php?p=14377061#p14377061 slow Mac], [https://getsatisfaction.com/mozilla_messaging/topics/thunderbird_17_on_mac_is_slow#reply_10981651 slow Mac], [https://getsatisfaction.com/mozilla_messaging/topics/cant_compact_my_box blocks compact], [https://bugzilla.mozilla.org/show_bug.cgi?id=1425279], [https://support.mozilla.org/en-US/questions/1194726]
*Bitdefender solved by disabling BD or adding exception for Thunderbird: [https://support.mozilla.org/en-US/questions/1277253 crashes Thunderbird], [https://support.mozilla.org/en-US/questions/1098049], [http://forums.mozillazine.org/viewtopic.php?f=39&t=1973177&p=10075691#p10075691] [https://getsatisfaction.com/mozilla_messaging/topics/does_tbird_24_3_0_run_very_slow (Expired GSFN article, tbird_24 very slow - solved by reinstalling BD)], you may need to disable BD
*BullGuard {{bug|537769}} and [http://forums.mozillazine.org/viewtopic.php?f=39&t=2007131] (see BullGuard solution below)
*Cloudmark Desktopone [http://forums.mozillazine.org/viewtopic.php?p=13221737#p13221737]
*Emsisoft Anti-Malware, Guard option [http://getsatisfaction.com/mozilla_messaging/topics/thunderbird_6_slower_at_sending_emails#reply_6588919]; [http://support.emsisoft.com/topic/2894-thunderbird-slows-to-a-crawl/ Nov2010 TB and Emsisoft forum post] indicates slowness may have been around since TB 3 days
*Emsisoft Online Armor firewall - thunderbird must be set as a "trusted" program [https://getsatisfaction.com/mozilla_messaging/topics/thunderbird_10_0_02_is_so_slow_as_to_be_almost_unusable#reply_8224968] [http://support.emsisoft.com/topic/4023-online-armour-slowing-thunderbird/]
*Eset NOD32 [https://support.mozilla.org/en-US/questions/1272471 hangs, and network/file errors], [https://support.mozilla.org/en-US/questions/1122731]], {{Bug|541197}}, [[http://gsfn.us/t/pavl getsatisfaction report]] <br>Repeated attempts to create huge temporary file during message synchronization due to Eset NOD32 causes slow gloda indexing , Password prompts not appearing when POP3S scanner is enabled in ESET settings [https://support.mozilla.org/en-US/questions/1199185#answer-1063288]
*F-Prot (see Solution for F-Prot Antivirus below)
*F-Secure causes Mac OS X to be slow: [http://forums.mozillazine.org/viewtopic.php?f=39&t=3026186], {{Bug|1328177}}
