Make it easier to benchmark and profile the code (#4780)

* Make it easier to benchmark and profile the code

* Remove unnecessary escape

* Clarify that the backend server is started without the frontend

* Add missing NODE_CONFIG_ENV environment variable

* Add error message when user has not included console.time statements

* Fix lint issue

* Handle multiple console.time statements

* Switch NODE_CONFIG_ENV to test

* Switch to const as variable never re-assigned