This is the best summary I could come up with:
GNOME 46 is getting ready for release in March and as such the alpha release is being prepared to facilitate early testing of this in-development desktop environment.
GNOME 46 is all the more important with it appearing in the likes of Ubuntu 24.04 LTS and Fedora 40 this spring.
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More profiling instrumentation has been added for helping to uncover performance bottlenecks.
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Fixing a performance problem due to repeated signal leak.
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Improved monitor on-screen display (OSD) labels.
The full list of GNOME Shell 46 Alpha changes can be found here.
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