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For $this->groupedpaths, using a key is faster as there is no need to do in_array searches. Parent cache allows dirname calls to be substantially reduced. 2048 was chosen as a cache size as this class operates on chunks of the restore at a time, 8k questions produces a parent cache of about 500 paths and uses 300K of memory. Scaling up to 2048 will use about 1.2M of RAM for really large restores. This is acceptable for the 48% function call reduction and the 10% runtime improvement seen.