What is "frozen_string_literal" in Ruby?
Freezing Strings feature improves apps performance by freezing Strings. So, Matz - Ruby's creator - decided to make all String literals frozen (immutable) by default in Ruby 3.0.
In order to have a transition path to this coming big change, it was decided to have a magic comment at the beginning of files, so you can use in Ruby 2.x. To do so, just add this comment in the first line of your files:
# frozen_string_literal: true
Try adding it to your
rails_helper file and let me know in the comments if your performance gets any better.
More info: Ruby issue #8976.