While Google recently released the Android Lollipop v5.1 update, the update is being rolled out to Nexus devices.
The Google Nexus 5 has started receiving the Android v5.1 Lollipop update in India. The update, measuring about 220.7 MB, is rolling out Over the Air and should reach users by next week. The update bears build number LMY47I. Users can manually check for the update by navigating to Settings -> About phone -> System update -> Check for update.
The Android v5.1 Lollipop update brings in improved performance and stability and bug fixes. The update is said to aid to improve upon performance via an enhanced ART (Android Run Time) that according to Google will make apps open faster than before. If you are a Nexus 5 user, then go ahead and check if the update has reached you.