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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.
A while back I wrote a fairly popular script that used the pushshift api to find overlapping users between subreddits. This doesn't work anymore since the api is down, so I threw together an updated script that does the same thing using the subreddit dump files.
You can go through the process outlined in that thread to download the subreddit's you're interested in, then add them at the top of the new script, run it and it will output the list of overlapping users. It will actually likely be faster than the old script even counting download times for the dumps since the api was so slow. Though you are limited to the available 20k subreddits.