Zero-copy page cache. The pcache returns direct pointers into pinned memory. No copies. Production Rust databases have solved this too. sled uses inline-or-Arc-backed IVec buffers, Fjall built a custom ByteView type, redb wrote a user-space page cache in ~565 lines. The .to_vec() anti-pattern is known and documented. The reimplementation used it anyway.
Initially I tried to do the same thing with libcsextimpl.so, but found that in the current Android version Google has turned it into a static library instead of a dynamic one, and even though making it dynamic again and trying to replace the open source version with a binary one, but it turned out to require way more dependency rewriting than I had expected, and I gave up.
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Unlike past launches, AMD is not providing its top-end laptop silicon for desktop use, at least not yet. None of these chips includes the full complement of 12 CPU cores that you can get in the Ryzen AI 9 HX 375 or 370; you also can’t get the Radeon 880M or Radeon 890M integrated GPUs. The three models AMD is announcing today top out at 8 CPU cores (likely split evenly between the faster Zen 5 cores and slower, smaller, and more power-efficient Zen 5c cores) and a Radeon 860M integrated GPU with 8 RDNA 3.5 graphics cores.