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thunder bird keeps crashing and running very slow

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Im running windows 8.1, windows defender, windows firewall and malwarebytes. Thunderbird email operates very very slowly when trying to perform any action including reading and writing/sending emails and it sometimes comes to a complete halt. I really like thunderbird when it used to work but now its useless Please help

Im running windows 8.1, windows defender, windows firewall and malwarebytes. Thunderbird email operates very very slowly when trying to perform any action including reading and writing/sending emails and it sometimes comes to a complete halt. I really like thunderbird when it used to work but now its useless Please help

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Your antivirus programs may be part of the trouble. Try restarting your computer in 'safe mode with networking': http://www.howtogeek.com/107511/how-to-boot-into-safe-mode-on-windows-8-the-easy-way/ If Thunderbird performs better then you can adjust your antivirus scanning: http://kb.mozillazine.org/Thunderbird_:_FAQs_:_Anti-virus_Software