Having your cake, and eating it too: Using Varnish to serve content from your new Drupal site...

This talk from DrupalCon Lille 2023 focuses on the challenges of migrating from legacy systems to new platforms, specifically addressing the 'big switch' concern. The speaker introduces an alternative approach that involves running both the old and new systems simultaneously by utilizing Varnish to effectively manage traffic between them. Through a detailed case study of the University of Limerick's website, the session covers key topics such as the differences between managing a custom Varnish instance and using third-party providers like Fastly, the out-of-the-box capabilities of Fastly, and the flexibility offered by VCL snippets. The speaker also discusses the advantages and risks of implementing a custom VCL configuration, along with tips to ensure optimal performance of Drupal in this setup.