Linux kernel 6.9 has been released after several months of attentive development. Linux founder Linus Torvalds announced the final release on the Linux

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Linux kernel 6.9 has been released with new features such as AMD P-State 'preferred core' support, Intel Fastboot support, and an update to CPU timer code. It also includes performance improvements, bug fixes, and support for various devices.

Linux Kernel 6.9 Released, This is What’s New

Optional FUSE pass-through should allow near native performance and CPU usage in some usecases/operations.
LVMVDO is merged. VDO is an incredible well performing deduplication layer that works similarly to ZFS. Only that unlike the OpenZFS implementation, it does so well. However, as it is an additional layer filesystems must be overprovisioned (be told there is more free space than really is) in order to take advantage of it. VDO works well under ZFS, but I recomend using a loop file on a datastore over a ZVOL for such usecase. Similarly, use a subvolume on BTRFS. Do not disable CoW.
NTSync is an optional module that promises enhanced performance on some corner cases for Wine. Specially graphic heavy usages (they are targetting gamers, gamers) .