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Despite the split of TileSpec into TileDef and TileLayer, the TileLayer struct is still 66 bytes large, and doesn't fit in a single cacheline. I'm moving the color member to cacheline 2, in the hope that it is less used and the compiler loads all the hot members in a single cacheline instead. Only color sits now in cacheline 2, all the other members are in cacheline 1. Note: is_color is probably rarely set, most nodes will likely not use hardware coloring, but this may change in the future. Ideally, this class is shrunk to 64 bytes.