Multi-row is laggy Rated 2 out of 5 stars

Having tabs on multiple rows has somewhat become a necessity for me, and it was working perfectly until 3.6.15, but since Firefox 4, enabling this function has caused Firefox to become laggy as soon as you open the first tab in the second row. I've been forced to move to Tab Mix Utilities and thankfully, this addon did not slow down Firefox with multiple rows.

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

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