Welcome to Android Central! Was this an official Lollipop over-the-air update? Or did you install it manually? If the latter, was it still the official update, or was it the Android L Developer Preview?
The Lollipop update does change Dalvik to ART--there is no longer an option to switch between the two in Developer Options.
How are you checking your free RAM? Are you looking at Settings>Apps>Running, or are you using some kind of RAM cleaning app? Don't use the latter, because those apps often take up a fair amount of RAM themselves, and thus report an inflated RAM usage number.
11-28-2014 01:54 AM