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grbl
An open source, embedded, high performance g-code-parser and CNC milling controller written in optimized C that will run on a straight Arduino (by gnea)
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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 other thing to consider is the $12 config in GRBL itself: Arc tolerance. Drawing circles is EITHER a long series of small line segments, OR an "arc". If this problem only effects arcs: you can likely limit your search there.
NOTE:
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Hence, a higher number means a more popular project.