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# Are you using the newest Thunderbird? <small>(Versions are listed at [https://www.thunderbird.net/en-US/thunderbird/releases/ releases]. The newest version there should match to your Help | About.  If check for Updates doesn't get you to that version, then download it from [https://www.thunderbird.net/ thunderbird.net].</small>)
# Are you using the newest Thunderbird? <small>(Versions are listed at [https://www.thunderbird.net/en-US/thunderbird/releases/ releases]. The newest version there should match to your Help | About.  If check for Updates doesn't get you to that version, then download it from [https://www.thunderbird.net/ thunderbird.net].</small>)
#Start Thunderbird in [https://support.mozilla.org/kb/troubleshoot-mode-thunderbird Troubleshoot Mode]. If Troubleshoot Mode helped, then start in normal mode. If the problem returned:
#Start Thunderbird in [https://support.mozilla.org/kb/troubleshoot-mode-thunderbird Troubleshoot Mode]. If it helped then start in normal mode. If the problem returned:
#*Visit Tools | Add-ons - disable two or more add-ons at a time (or themes or language packs) to determine which might be causing the problem. Are any Add-on items in the [[#Other_Software|list of Problem Extensions]]?   
#*Visit Tools | Add-ons - disable two or more add-ons at a time (or themes or language packs) to determine which might be causing the problem. Are any Add-on items in the [[#Other_Software|list of Problem Extensions]]?   
#*Contact the '''author''' of suspected bad add-ons using their support website or email.  
#*Contact the '''author''' of suspected bad add-ons using their support website or email.  
#Start OS in safe mode. Instructions: [https://support.microsoft.com/en-us/help/12376/windows-10-start-your-pc-in-safe-mode win10], [https://support.microsoft.com/en-us/help/17076/windows-8-startup-settings-safe-mode win8], [https://support.microsoft.com/en-us/help/17419/windows-7-advanced-startup-options-safe-mode#start-computer-safe-mode=windows-7 win7], [https://support.apple.com/kb/PH25617?locale=en_US MacOS]. If performance is improved in safe mode, then  
#'''Start OS in safe mode. Instructions: [https://support.microsoft.com/en-us/help/12376/windows-10-start-your-pc-in-safe-mode win10], [https://support.microsoft.com/en-us/help/17076/windows-8-startup-settings-safe-mode win8], [https://support.microsoft.com/en-us/help/17419/windows-7-advanced-startup-options-safe-mode#start-computer-safe-mode=windows-7 win7], [https://support.apple.com/kb/PH25617?locale=en_US MacOS]. If performance is improved in safe mode, then'''
#* test with antivirus disabled or removed - because we constantly see reports of antivirus causing slowness, and disabling isn't always reliable. Check [[Thunderbird:Testing:Antivirus Related Performance Issues|AV performance issues]] for examples for your software, including [[Thunderbird:Testing:Antivirus_Related_Performance_Issues#Microsoft_Windows_Defender_aka_%22Antimalware_Service_Executable%22_(ASE)_aka_MsMpEng.exe|Microsoft Defender]]
#* test with firewall disabled or removed <small>[https://support.mozilla.org/en-US/questions/1133857 Ad-Aware example]</small>
#* check for software loaded at boot time as a possible cause
#* run only one antivirus, one firewall, one malware (never multiples of each - more is not better)
#* on macOS, try with [https://support.apple.com/kb/PH25607 Time Machine disabled]
#* check for newer version of AV/firewall software, and check with vendor's support site for problem reports  
#* check for newer version of AV/firewall software, and check with vendor's support site for problem reports  
#* test with antivirus disabled or removed - because we constantly see reports of antivirus causing slowness, and disabling isn't always reliable. See [[Thunderbird:Testing:Antivirus Related Performance Issues|AV performance issues]] for examples and settings.
#* uninstall Thunderbird, then '''DELETE''' the Thunderbird '''PROGRAM''' directory (not the data directory), then [https://www.mozilla.org/thunderbird/ download], reinstall, and retest Thunderbird. <small>If using beta get it from [https://www.thunderbird.net/download/beta/ channels].</small>   
#* on Windows, especially Windows 10, try disabling MS-Windows Search (see next numbered item below)
#* test with firewall disabled or removed <small>[https://support.mozilla.org/en-US/questions/1133857 Ad-Aware example]</small>
#* any software loaded at boot time is a possible cause
#*run only one antivirus, one firewall, one malware (never multiples of each - more is not better)
#*on macOS, try with [https://support.apple.com/kb/PH25607 Time Machine disabled]
#*uninstall Thunderbird, then '''DELETE''' the Thunderbird '''PROGRAM''' directory (not the data directory), then [https://www.mozilla.org/thunderbird/ download], reinstall, and retest Thunderbird. <small>If using beta get it from [https://www.thunderbird.net/download/beta/ channels].</small>   
#Do you have Calendars?  
#Do you have Calendars?  
#*Try disabling two or more at a time.  
#*Try disabling two or more calendars at a time.  
#*If you have many recurring, never ending calendar appointments try reducing the time period and number of them. <small>Less likely starting with version 128's fix for {{bug|1844408}}. Examples: [https://www.reddit.com/r/Thunderbird/comments/16c89wo], [https://www.reddit.com/r/Thunderbird/comments/18ypd8r/comment/kgcyox8/] </small>
#*If you have many recurring, never ending calendar appointments try reducing the time period and number of them. <small>Less likely starting with version 128's fix for {{bug|1844408}}. Examples: [https://www.reddit.com/r/Thunderbird/comments/16c89wo], [https://www.reddit.com/r/Thunderbird/comments/18ypd8r/comment/kgcyox8/] </small>
#*Try setting calendar.caldav.multigetBatchSize > 100 <small>(100 is default, you must create the preference [https://bugzilla.mozilla.org/show_bug.cgi?id=1543953])</small>
#*Try setting calendar.caldav.multigetBatchSize > 100 <small>(100 is default, you must create the preference [https://bugzilla.mozilla.org/show_bug.cgi?id=1543953])</small>
#If you have gmail accounts, is problem gone after [http://kb.mozillazine.org/Using_Gmail_with_Thunderbird_and_Mozilla_Suite#Subscriptions unsubscribing the "All Mail" folder]?  
#'''If you have gmail accounts, is problem gone after [http://kb.mozillazine.org/Using_Gmail_with_Thunderbird_and_Mozilla_Suite#Subscriptions unsubscribing the "All Mail" folder]?'''
# On Windows, did you move the Thunderbird profile directory or any Thunderbird account from the default location "[https://www.nextofwindows.com/how-to-access-user-profiles-appdata-folder-the-easiest-way-in-windows-7 %APPDATA%]"?  If yes, then MS-Windows Search will [https://bugzilla.mozilla.org/show_bug.cgi?id=1083233 attempt to index all Thunderbird disk activity]. [http://www.sevenforums.com/general-discussion/215354-how-prevent-showing-search-results-drive-folder.html#post1805728 Disable Windows indexing for your Thunderbird data].
#'''Folders should be well maintained'''. Help | Troubleshooting lists large folders. Folders may also be broken. Signs of problems and common maintenance steps:
# On macOS, try disabling Thunderbird's access to Mac Contacts in Mac System Settings|Privacy & Security|Contacts.
#Folders should be well maintained - if not then the folder index takes more memory and time to load. Help | Troubleshooting lists large folders. Folders may also be broken. Signs of problems and common maintenance steps:
#* Do you see high memory or delay when opening a specific folder, deleting or archiving, moving message to a specific folder?  
#* Do you see high memory or delay when opening a specific folder, deleting or archiving, moving message to a specific folder?  
#* Do any folders lose their sort order or column settings?
#* Do any folders lose their sort order or column settings?
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#* Do any Inbox or filtered folders have several thousand messages?  If so, especially for Inbox, consider moving some messages to another folder. Perhaps use [https://support.mozilla.org/en-US/kb/archived-messages Archive].
#* Do any Inbox or filtered folders have several thousand messages?  If so, especially for Inbox, consider moving some messages to another folder. Perhaps use [https://support.mozilla.org/en-US/kb/archived-messages Archive].
#* Are [https://support.mozilla.org/en-US/kb/compacting-folders compacts] routinely performed?  Compact must be automatic or done regularly (at least weekly) using [https://support.mozilla.org/en-US/kb/menu-reference#w_compact-folders manual File > Compact Folders]?
#* Are [https://support.mozilla.org/en-US/kb/compacting-folders compacts] routinely performed?  Compact must be automatic or done regularly (at least weekly) using [https://support.mozilla.org/en-US/kb/menu-reference#w_compact-folders manual File > Compact Folders]?
#If [[#Memory Overview|Thunderbird memory usage is more than 1-2GB]] then perhaps  folders are corrupted or not being closed. Please :  
# On Windows, did you move the Thunderbird profile directory or any Thunderbird account from the default location "[https://www.nextofwindows.com/how-to-access-user-profiles-appdata-folder-the-easiest-way-in-windows-7 %APPDATA%]"?  If yes, then MS-Windows Search will [https://bugzilla.mozilla.org/show_bug.cgi?id=1083233 attempt to index all Thunderbird disk activity]. [http://www.sevenforums.com/general-discussion/215354-how-prevent-showing-search-results-drive-folder.html#post1805728 Disable Windows indexing for your Thunderbird data].
# On macOS, try disabling Thunderbird's access to Mac Contacts in Mac System Settings|Privacy & Security|Contacts.
#If [[#Memory Overview|Thunderbird memory usage is more than 1.5GB or more]] then folders may be corrupted or are not being closed. Please :  
#*Get a diagnostic log of Thunderbird activity with '''MSGDB:5,timestamp''' using [[MailNews:Logging|logging instructions]]. <!-- You must install and use [ftp://ftp.mozilla.org/pub/thunderbird/nightly/latest-comm-1.9.2/ a 3.1beta build appropriate to your OS]  [http://s3.mozillamessaging.com/build/try-server/list.html tryserver build] appropriate to your platform that includes ''010-01-14_08:10-bienvenu@nventure.com-1263484981/bienvenu@nventure.com-1263484981-mail-try'' in the name -->  
#*Get a diagnostic log of Thunderbird activity with '''MSGDB:5,timestamp''' using [[MailNews:Logging|logging instructions]]. <!-- You must install and use [ftp://ftp.mozilla.org/pub/thunderbird/nightly/latest-comm-1.9.2/ a 3.1beta build appropriate to your OS]  [http://s3.mozillamessaging.com/build/try-server/list.html tryserver build] appropriate to your platform that includes ''010-01-14_08:10-bienvenu@nventure.com-1263484981/bienvenu@nventure.com-1263484981-mail-try'' in the name -->  
#*[https://bugzilla.mozilla.org/enter_bug.cgi?product=Thunderbird&format=guided File a bug], then edit the new bug and attach the zipped log file using "Add an attachment".  
#*[https://bugzilla.mozilla.org/enter_bug.cgi?product=Thunderbird&format=guided File a bug], then edit the new bug and attach the zipped log file using "Add an attachment".  
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* ogplanet Game Launcher/npOGPPlugin.dll {{Bug|543082}} slow opening an email on windows
* ogplanet Game Launcher/npOGPPlugin.dll {{Bug|543082}} slow opening an email on windows
*Secunia PSI  
* Secunia PSI  
*THE SHIELD {{bug|542156}}  
* THE SHIELD {{bug|542156}}  
*Eset NOD32 {{Bug|541197}} Repeated attempts to create huge temporary file during message synchronization due to Eset NOD32 causes slow gloda indexing  
* Eset NOD32 {{Bug|541197}} Repeated attempts to create huge temporary file during message synchronization due to Eset NOD32 causes slow gloda indexing  
*F-Prot Antivirus may cause very slow access to mailbox files. See: [[Thunderbird:Testing:Antivirus Related Performance Issues|Antivirus Related Performance Issues]]
* F-Prot Antivirus may cause very slow access to mailbox files. See: [[Thunderbird:Testing:Antivirus Related Performance Issues|Antivirus Related Performance Issues]]
* [[Thunderbird:Testing:Antivirus_Related_Performance_Issues#Microsoft_Windows_Defender_aka_%22Antimalware_Service_Executable%22_(ASE)_aka_MsMpEng.exe|Microsoft Defender]]


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