this post was submitted on 11 Jul 2023
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Lemmy

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Can one have too many subscriptions? (lemmy.ml)
submitted 1 year ago by [email protected] to c/[email protected]
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Just from a performance perspective, when your feed is being retrieved, I can only presume that the more communities you're subscribed too the more intensive the query is?

At some point does it not get prohibitive? Is there a limit on the number of communites one can subscribe to.

If true, I see this as a good reason for user created multi or meta-communities. This way, I can look at a feed of only a subset of communities at a time which should lessen the load on the server, and also be a better interface because I honestly don't want all of the communities I'm interested in being fed into a single feed.

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[–] [email protected] 3 points 1 year ago (1 children)

Good point! I should have thought about that ... I just don't use that feed. There's a chance that it's relatively efficient because it'd be the same for everyone and so is basically calculated once for the whole instance.

[–] [email protected] 3 points 1 year ago (1 children)

Once for the whole instance

Not necessarily. I have a very long blocked communities list which is likely unique to me. I believe thats taken into account when pulling /all

[–] [email protected] 2 points 1 year ago

Even the person to person blocking is taking into consideration with that query. Lemmy's SQL output isn't well optimized for caching, it puts a lot of work on PostgreSQL to customize these views. It is only users who are not logged-in that would get a repeatable query.