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While GNOME landed experimental Variable Refresh Rate (VRR) support in GNOME 46 that is used by the new Ubuntu 24.04 LTS release, Canonical isn't yet encouraging users to test out this option.
While back in December the GNOME dynamic triple buffering was self-proclaimed to be 'ready to merge', so far that hasn't happened yet
In addition to the GNOME triple buffering patches that still haven't been merged to Mutter's mainline branch, Ubuntu 24.04 LTS and upstream Debian are slated to currently carry a few extra performance optimizations.
It looks like GNOME 46 might finally see the dynamic triple buffering support merged for Mutter to enhance the performance particularly for systems with integrated graphics.
Ubuntu desktop developer Daniel Van Vugt has been working on enabling zero-copy support for discrete GPUs within GNOME's Mutter compositor to deliver faster performance