Hot Hardware published a review on the NVIDIA SHIELD Tablet Android Lollipop Update Hands-On With Benchmarks A quote from the article:

NVIDIA gave us early access to the Android Lollipop update and we?ve been poking around on it with our SHIELD Tablet since.

Some of the changes are subtle, but others are more significant and definitely give the tablet a different look and feel over the original Android KitKat release. There's more to Lollipop than just tweaks to the UI, however. Animations have been optimized, there's a new notification area, new graphics APIs for advanced gaming, Android Runtime (ART) for better responsiveness, and several other improvements that should enhance battery life and security as well.

To see how Lollipop impacted the SHIELD Tablet's performance, we ran a few quick benchmarks fo course as well...

 NVIDIA SHIELD Tablet Android Lollipop Update Hands-On With Benchmarks @ HotHardware