Phoenix json API extremely slow when serving CSV files

Totally agree, @ dimitarvp.
Please understand that I am under much pressure about this task. I didn’t have years to study Elixir, just a couple of weeks, but it convinced me. I’m coming from the OOP world (C#, Java, php) so the functional paradigm still feels strange to me.
I’m still trying to give Elixir a chance but the deadline for this task is coming close and I have to deliver something. Using Elixir/Phoenix or something else…
Thanks.
Q.T.