![]() Then go to Thunderbird, then the Profiles folder. To find this hit Windows Key + R and type "%appdata%". Scroll down to Exclusions, click "Add/Remove exclusions".Īdd a Process exclusion for "thunderbird.exe"Īdd a folder exclusion for the Mozilla Thunderbird profile folder. Then click "Virus & Threat protection Settings" On the left, click "Virus & threat protection" Here's how to fix it.Ĭlick the bottom right System Tray (the upwards arrow) so you see the system icons.Ĭhoose "View Security Dashboard" - this will open the Windows Defender control panel. After some research I found it was Windows Defender causing the problem and you have to exclude both the Thunderbird process and profile folder. Thunderbird would hang and go into "Thunderbird is not responding" mode, which was a bit of a nightmare. Working with Windows 10, I switched from Avast to Windows Defender and found it slowed down Thunderbird an awful lot.
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