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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Remember, bad C++ code will certainly be slower than good code written in an interpreted language! That being said, Lua is very fast, one of the fastest scripting languages. See this thread, which talks about LuaJit.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.