this post was submitted on 29 Jul 2023
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One big difference between the json requests and a user callling for the site directly is your instance pulls all the data all the time, whereas a user only pulls the data they use themselves.
Just to be pedantic, it's not pull, it's push: the data is POSTed from the server that hosts the community.
Right now loading a page makes a bunch of API queries to pull all the related data for the posts, votes, sidebar info, and so on AND the API is very untuned and sending way more data than the WebUI/a client needs to actually generate a page: hence my 'it's less efficient' comment, though this is certainly something that can be tweaked to improve performance between the back and frontends.
I will, however, admit that this is only true if someone is actually reading the content they're subscribed to. The 'subscribe to everything' scripts turn this math on its head because now you are using resources to gather data you don't care about.
Actually, the instance you federate with will push the data, and they do so at their own leisure (configurable by the instance admin), and the data itself is already created in the queue (minimal database load), so it definitely have lower impact than actual users browsing the site.