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Sometimes it crash the Thunderbird and do full sync every time.
Full sync is significally slow, thunderbird becomes unresponsive.
calendar.threading.latency helps. But TB still CRASHES a lot.

Это отзыв для предыдущей версии этого дополнения (2.7). 

Please try changing calendar.threading.latency to 90 in the advanced config editor (Preferences > Advanced > General > Config Editor). Let me know if it works!