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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.
Importantly, slowing down a fast song or speeding up a slow song to be just slightly outside of your comfort level, then aiming for a good accuracy such as 98% will help you build up speed and reading skills. FnF engines doesn't have a convenient way to do this, but osu!mania can if you install Osu Trainer (otherwise you're only stuck with half and double time).
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Hence, a higher number means a more popular project.