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#*Visit Add-ons and Themes - disable two or more extensions, themes or language packs at a time to determine which might be causing the problem. Are any in the [[#Other_Software|list of Problem Extensions]]? | #*Visit Add-ons and Themes - disable two or more extensions, themes or language packs at a time to determine which might be causing the problem. Are any in the [[#Other_Software|list of Problem Extensions]]? | ||
#*Contact the '''author''' of suspected bad add-ons using their support website or email. </small> | #*Contact the '''author''' of suspected bad add-ons using their support website or email. </small> | ||
#'''Start OS in safe mode. Instructions: [https://support.microsoft.com/en-us/help/12376/windows-10-start-your-pc-in-safe-mode win10], [https:// | #'''Start OS in safe mode. Instructions: [https://support.microsoft.com/en-us/help/12376/windows-10-start-your-pc-in-safe-mode win11+win10], [https://answers.microsoft.com/en-us/windows/forum/all/how-to-boot-windows-7-in-safe-mode/0216561f-4e12-47d6-8637-85fd98469f01 win7], [https://support.apple.com/kb/PH25617?locale=en_US MacOS]. If performance is improved in safe mode, then'''<small> | ||
#* 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 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 [https://support.mozilla.org/en-US/questions/1133857 Ad-Aware example] | #* test with firewall disabled or removed [https://support.mozilla.org/en-US/questions/1133857 Ad-Aware example] |