The c++ standard also requires that the memory for <vector> is contiguous like a C array. You can try reserving the memory soon after program start and keep the array around until you load the data, the memory has the least chance of being fragmented before anything else is allocated. You can also split the data into smaller blocks and attach multiple geometries to the same geode - the 3dc plugin does this to limit the blocks to 10,000 points
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