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Every face looked up its neighbour in a HashMap keyed by BlockVector, whose hash codes collide heavily; on the woodland mansion that took 1.8 s of a 2.4 s build, so making a block see-through lagged by seconds. The blocks now go into an array over the object's bounds, which brings the build down to about 50-70 ms with the same faces. Opening an object gets the same speed-up. Model used: Claude Opus 5.5