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why is Thunderbird so slow on my new computers?

gfhn1949

My two new computers (Lenovo PC and HP laptop) both run Windows 8. Thunderbird is extremely slow on both when selecting and deleting messages. Get frequent 'not responding' messages.

My two new computers (Lenovo PC and HP laptop) both run Windows 8. Thunderbird is extremely slow on both when selecting and deleting messages. Get frequent 'not responding' messages.

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What is your firewall /virus protection?

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Thank you - " Uncheck Email attachments under Real Time Scanning > Settings > Scan these attachments and locations" worked.