Comment 94 for bug 1458593

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In , David Albert (t-david-j) wrote :

Another datapoint: this problem only manifests on Windows. I run Thunderbird+Lightning on multiple Linux platforms with no problem, however on Windows, TBird+Lightning+Provider for Google Calendar = huge startup delays + frequent UI blocked for several seconds at a time. This suggests a blocking call to access the calendar API is taking place in the UI thread.

A good workaround for windows users is the Google Calendar Tab add-on for Thunderbird.