Setup Steps

1. mix deps.get
2. iex -S mix phx.server

Reproduction Steps

1. Open GraphiQL Workspace at http://localhost:4000/graphiql
2. Run query:

query customersQuery { customers { ... on CustomerAccount { id name } ... on CustomerContact { id firstName lastName phoneNumbers { id label number } } } }

3. The response size here is 19770 bytes. And in the console I have: [info] Memory At Resolver Start: 68064 [info] Memory Before Absinthe Send: 973408
4. So it seems like to generate this response it uses 45x the memory required for the formatted data.

Control Group

1. Open http://localhost:4000.
2. The response size here is 9800 bytes. And in the console I have: [info] Memory At Action Start: 21624 [info] Memory Before Plug Send: 142784
3. So it seems here to generate the response it uses 12x the memory required for the formatted data.