Rated 5 out of 5 stars

new version 1.0.1 is OK, but .... when I insert new calendar (inside i have 8 shared calendars with other people), calendars is visible for first 20 second and then TB stop or very very very slow responsing... after uninstall addon is O.K.

This review is for a previous version of the add-on (1.0.1). 

Be patient. The first synchronize takes a while, especially with a large calendar. Once this is done, all subsequent synchronizations will be very fast because only changes are synchronized. Do you know about how many events you have in your calendar? Maybe I can optimize performance based on this. Check the support link for my email.