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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.
It could probably be sped up using SIMD instructions, e.g. AVX2, but Go doesn't have SIMD intrinsics yet, so that involves writing assembly code (possibly generated from another language that does support intrinsics like C). Look at go-simd for how it's done (he used Clang to generate the assembly, and it needs to be converted to Go's Plan9 format).
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