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Continuation of #894. This patch introduces a cache for subschemas-related keywords, which reduces the number of calls to the search routine. All subschemas-related keywords are searched in one pass and then stored in a cached dict. With the OP from #893 it reduces the total number of function calls from 61512655 to 56438634 (~9%). The number of calls to the search routine is reduced 5x (from 1090000 to 218000).
I'd be happy to know what do you think :)