Slows down Thunderbird Rated 5 out of 5 stars

I appreciate your work on developing this add-on a lot. Lightning is one of the "only-solution"s for Linuxers. So developing and debugging it means a lot especially to Linux users.The only problem I have been facing for a couple of months, is the sluggishness of Thunderbird when this add-on is enabled. This has become even more severe after the recent Thunderbird's update to 17.0.6. It causes TB to stop responding, and the only solution for me was disabling it and waiting for another update. I appreciate if you could find a fix for this issue.5 stars for being the most awesome TB add-on for such a long time!

FIX: I found a solution for a.m. slow performance, just disable offline support. It improves speed a lot!

This review is for a previous version of the add-on (1.9.1).