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7ff0ae19d6
Prior to this commit, upgrade schemas would be applied to blockstates with the same version, as there wasn't any way to know if they should be applied or not given Mojang's tendency to forget to bump the version. However, it occurred to me that we only need to do this if there are multiple schemas present for the same version ID, which is rarely the case. This allows skipping costly logic for blockstates on the newest version (the common case), reducing the time taken to process the blockstate for upgrading by over 30%. Overall, this translates into less than 10% real performance improvement for chunk loading, but it's still a worthwhile improvement.