Here is a link to a blog-post by Darrell Ulm to do a performance audit for the new Drupal 8 on the Drush command-line and the Drupal site_audit module, posted back in May 2016.
The link below is for the Drupal Profile for Darrell Ulm, a Drupal user and code contributor for over 10 years.
The profile here Drupal Profile link for Darrell Ulm, contains information about projects such as the project using the Google API for Books (i.e. Google Books), content access restriction modules such as IP Path Access and FileField Role Limit, and other modules coded primarily in PHP/MySQL.
Also have Acquia Certified Developer status now as can be seen here.
The Google Books module for Drupal 7 is an input filter module that takes titles, authors, ISBN and other Library of Congress ids and pulls book data into Google Books based on information given to the input filter, i.e. the information between square brackets with the google_books: filter tag.
Example: [google_books:search string]
An early Drupal 8 post, by Darrell Ulm, when Drupal 8 was still evolving is here: Drupal 8 Article: Should you be interested in the new Drupal 8? (by Darrell Raymond Ulm).
And believe this is before the internals of Drupal 8 was re-implemented in Symfony PHP framework as compared to the inherent PHP implementation of prior versions for Drupal and the Drupal 4 5 6 and 7 API.