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cb29d6485e
Profiling alternator implied that JSON parsing takes up a fair amount of CPU, and as such should be optimized. libjsoncpp is a standard library for handling JSON objects, but it also proves slower than rapidjson, which is hereby used instead. The results indicated that libjsoncpp used roughly 30% of CPU for a single-shard alternator instance under stress, while rapidjson dropped that usage to 18% without optimizations. Future optimizations should include eliding object copying, string copying and perhaps experimenting with different JSON allocators.