The issue

The app was initially a project of mine developed for the sake of getting my hands on Gatsby.
However it later became a more serious project as it was something we actually started using in my company.
At one time I understood Gatsby was not the best choice for this use–case as it makes some parts of the development painful while not giving any extra benefit to this particular project.

Solution

I'm going to migrate the app to a Single Page App which is going to use Vite.js.
Build times will be a whole lot better and the code will be a bit leaner by removing all of the Gatsby related stuff.