Installed TB on my new PC but it's soooo slow and stops all the time.

I just bought a new computer and installed TB on it. For some reason, it very, very slow - if it responds at all. What's ahappened and (more important) how do I fix it?

Most likely McAfee is the problem.
https://wiki.mozilla.org/Thunderbird:Testing:Antivirus_Related_Performance_Issues#McAfee

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