Geometric Picking Finally Lands In GNOME/Mutter 3.34 For Lowering CPU Usage
Written by Michael Larabel in GNOME on 2 September 2019 at 06:33 PM EDT. 51 Comments
GNOME --
In addition to Mutter seeing today an important last minute performance fix for the NVIDIA proprietary driver, Mutter also saw a long-standing performance optimization finally land for GNOME 3.34 that benefits all hardware/drivers.

The optimization is another patch series worked on by Canonical's Daniel van Vugt over the past year but finally saw its way into Mutter Git today ahead of next week's GNOME 3.34.

This is about cursor movement and now avoiding OpenGL/GPU usage for the color picking operations. That logic is now being done on the CPU without OpenGL but turns out is more efficiently done this way and is able to cause a measurable drop in CPU usage when moving the mouse cursor and especially when moving around windows.

This is a big performance win and great to see it squeeze into GNOME 3.34. With this code landed, I'm even more excited for GNOME 3.34 with its many Wayland support improvements and especially the number of performance optimizations that landed over the past half-year.

While already good in its current form and developers are confident the patches have been tested enough to land it in the last moments of the GNOME 3.33/3.34 cycle, more geometric picking improvements are planned moving forward.
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Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 20,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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