Playing with beta 6 up from beta 5, and it seems that for some reason, the stats display shows that my tri count is around half of what it was before I updated! Yet, my framerate seems to be lower than it was prior to the update?
Is this a case of Unity not knowing the actual poly count of my scene (because my vert count is the same as it was prior to the update), or is it a different way of displaying the poly count? And what about the performance drop (from 40-45 to 30-35).
Yes, I am also getting a performance drop in my project (of about 10-12 fps) when upgrading from beta 5 to beta 6. 
check the textures, they might potentially have become suboptimal if they are from an upgraded project.
realized that it now squares textures if you have auto complete, but it does not automatically square pot2 them, so you get a massive waste of memory and performance at no gain (in my case even crash of the game on 3GS as the required memory for the textures exploded by over 15mb)
The performance drop happens only with the beta 6.
Not to mention my poly count in a game has become half of what it was (1.6 mil to 800,000). I wouldn’t be complaining actually if I received the natural performance boost from it, but it’s a performance drop instead.
I’ll file a bug report.