Moto,
We got an over-the-air update on Sunday night.... Perf Pages disappeared for a bit but came back.
I will say that after a start-up it does take a minute or 2 until Perf Pages is available. And until that time the icon is missing.
Also, if immediately after start up we go to the 2nd page of the apps screen and its not there we found that we had to select something else (Nav) and then go to apps in a minute or so to find it.
Later
Brian