== shift0(4, shift0(3, shift0(1, App("f", [Var(0), Var(1), Var(2)]))))
Big performance gains: Upgraders will enjoy enhanced speed and responsiveness with 12GB of unified memory and 120GB/s of memory bandwidth, and will experience even more seamless windowing in iPadOS 26. Users coming from iPad Air with M1 will see up to 2.3x faster performance, with over 4x faster 3D pro rendering with ray tracing performance.5，详情可参考新收录的资料
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the overhead of stack spilling is fixed,