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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.
You can use Instruments the comes with Xcode to measure execution time. There are other benchmarking tools such as https://github.com/google/swift-benchmark which can be used as well. Remember to compile with optimizations when measuring.
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.