This is the best summary I could come up with:
With the 45 beta milestone there are many improvements and new features in store for the GNOME Shell desktop and Mutter compositor.
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Improvements to the GNOME Shell light style variant.
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A dedicated KMS thread is added to help with lower input latency.
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Fixing a flickering situation when a DRI driver isn't available.
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Fixing the handling of the XWayland byte swapped X11 clients support setting.
With the freezes upon us, it looks like GNOME 45 will be still missing out on the dynamic triple buffering support that is currently carried by Ubuntu and Debian.
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