In this video you can see lags in the Easter egg in Android Lollipop on Nexus 5
What does purple colour mean?
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Purple is "prepare"
It has been added in Lollipop, so now we get: draw (blue), prepare (purple), process (red), execute (yellow)
If you do
adb shell dumpsys gfxinfo, the table for each app now has 4 columns (with prepare added between draw and process)
I have yet to find any documentation on this yet :)