The Steam client continues to improve with the latest Steam Client Beta. It includes some overdue optimizations!
The Valve developers have managed to reduce the CPU and battery use of Steam when it's running in the background, hopefully giving us all a smoother experience.
Also, the Steam Overlay finally got a little bit smarter. It should now be aware of a monitor's DPI and scale properly for games running at higher resolutions.
There's also some updates to Steam Input, including a new layers feature for Action Sets which they say works like Photoshop layers, allowing for quick modifications.
On top of that, they also fixed the DS4 Gyro when streaming over a Steam Link.
See the full update notes here. Lots of little improvements do go a long way, I hope to see them continue to improve the Steam client when using higher resolutions. On Linux, the Steam client doesn't scale at all and it's quite annoying if you have a 4K monitor.