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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.
Have a read of https://github.com/matrix-org/synapse/wiki/Running-synapse-on-Single-board-computers it's only really specific actions that are slow.
On its project GH roadmap, why then does it say:
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.