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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.
Well taggit is basically M2M already. It even has a 'similar_objects' method. The problem is, especially for a list view, that the query is ran for each blog post item and you can't prefetch it. Which certainly slows everything down.
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.