TL;DR
Better way and Efficient methods to build a massive data structure (like a snapshot), or this is job for another language?

In-deep
In a Redis server, we have segmented objects by parameters. The base object is institute, this have a base json object with parameters like address, phone number, code, id, etc. Then, this institute have nested keys with data (json object), like institute:<code>:teachers, institute:<code>:executive and others.
There is a builder that create this massive structure by many institutes with a list of institute codes, one by one, this generate a base structure and merge and add the nested objects.

A little example:

%{
    "institute-a" => %{
      address: "Street A 453",
      id: 12,
      status: "active",
      online: true,
      location: %{
        country: "United State",
        state: "CA",
        city: "Los Angeles"
      },
      teachers: %{
        "john-doe" => %{
          age: 35,
          asignatures: ["Art", "Music"],
          id: 999
        },
        ...
      },
      courses: %{
        "A1" => {
          students: %{
            "carol-doe" => %{
              age: 15,
              grades: %{
                "music" => "A",
                "arts" => "B+"
              },
              ....
            }
          }
        }
      }
    },
    ....
  }

The duration to build this structure was nice (5 secs), but more institutes was added to the Redis server, already we have 500 institutes.
I try many forms, but, when the data is so massive, the request time is like 15~20secs to show this request data or send as response in a channel event.
I know elixir is not friendly with this kind of process, this is temporary, but I need ideas to be more efficient and respecting the elixir way to code.