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Thunderbird is horribly slow on my laptop, running Windows 10 and Avast antivirus. Slow to key new messages, slow to load messages, slow to delete messages.

Thunderbird Troubleshooting
christ1 replied
amcorke
amcorke

When keying, response is painfully slow, several seconds, and I'm not the fastest typist! \

When keying, response is painfully slow, several seconds, and I'm not the fastest typist! \

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christ1
christ1
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What is your anti-virus software?

amcorke
amcorke Question owner

christ1 said

What is your anti-virus software?

Avast

christ1
christ1
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  • Moderator

Avast is known to cause problems for Thunderbird. See https://wiki.mozilla.org/Thunderbird:Testing:Antivirus_Related_Performance_Issues#AVAST

Also make sure to create an exception in Avast for the Thunderbird profile folder. http://kb.mozillazine.org/Profile_folder_-_Thunderbird