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InfluxDB
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Regarding PRAW’s resource usage, I think you’ll enjoy my new library RedditWarp better because it has a more efficient streaming mechanism.
If you're even remotely concerned with performance, it's far more efficient to to just do all that yourself and then fine tune how long you sleep for. Just make the request to each separate endpoint, skip any objects you've seen before and do your processing. That's what I do in my moderation bot (though it's somewhat abstracted there). I also sleep 60 seconds between checks, for stuff that also needs to be fairly prompt, and I haven't ever had any problems.