Postgresql Ecto query speed

[peerreynders]

Mapping over ~250 structs seems slow

I’m doing a .map over a list of Ecto structs and that seems to take quite a lot of time on Heroku. I’ve been using AppSignal to benchmark that particular code, and there is a strong correlation between the number of items in the list and the time it takes for the function to complete. For users that have a list of 200-300 structs, it could take from 400ms to 800ms to complete, which seems a lot to me. Originally I was doing Enum.map, but subsequently converted to using Task.async_stream which …