Nexus 5X users have been experiencing a some issues and a few of them are getting squashed today. The big ticket item is “general slow/sluggish performance.” It’s not clear if the camera sluggishness is included in that.
Additional changes include Bluetooth and Wi-Fi improvements (users report choppy playback after long uptime). The issue of the next DND alarm disappearing has been fixed too. Additionally, there are carrier-specific fixes.
The new update (MHC19J for most Nexus 5X devices out there) is rolling out today, so be on the lookout for the notification.
The security updates for March have been included in this release.