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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 only demo I can think of that showed impressive performance was the Solitaire Android app. The code is OSS, so you can see exactly how it's been developed. What else have we demoed but not shared that you'd like to see? I promise, we don't do much to optimise the demos, the focus is typically "how do we show this feature in the easiest to consume way".
NOTE:
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Hence, a higher number means a more popular project.