How to speed up Rubocop

Recently I’ve noticed that when I run Rubocop it seems to hang for ages before eventually running. This is not ideal when time could be better spent.

I had a look online and found this StackOverflow question with someone who had the same issue, which they ended up kindly answering as well. I put the following piece of configuration at the top of my .rubocop.yml file and it solved the issue:

inherit_mode:
  merge:
    - Exclude

This means that it won’t analyse files it shouldn’t i.e. node_modules.