Just installed the module and playing around with it. It made some good suggestions for indexes right away as well as a couple that didn't seem relevant. Also seems to complain about filtering on text even if you're filtering against it being not empty, which should be quite fast.

But anyway - I've noticed under explain views that sometimes I just have a straight listing of views, and sometimes I have additional "temp" views displayed. The normal views have decent run speeds, but the temp values are terrible.

What are these temp values being displayed?