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Fewer tiles do not mean faster solves: adaptive quadtree and kd-tree partitioning actually underperform naive uniform grids in least-squares phase unwrapping due to partition construction overhead and the superlinear cost of solving large retained tiles.
Careful SIMD register blocking and memory layout beat algorithmic operation-count reductions, enabling a pure ARM NEON 2D DCT that decisively outperforms Apple's own Accelerate framework, FFTW, and OpenCV.