Did you try to check which Computer Protection component slows thunderbird?
It can be on access scanning or Web traffic scanning or maybe even Deepguard.
You can figure it out by disabling these components one by one and see when issue disappears.
When you know component - we can figure out how to add exclusion for this component.
You can as well exclude thunderbird from scanning using global exlusion list - it's simple but unsafe option.
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