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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.
The answer to "can I just use XX without a hit in performance" is always "measure it and find out", with some generalisations thrown in for good measure. Have a look at https://benchmarkdotnet.org/ it shouldn't be too much of a hassle to throw together a quick test. You can even make a separate "benchmark project" where you have .net benchmark setup and can always write a quick test when an interesting thing comes up.
NOTE:
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Hence, a higher number means a more popular project.