Someday, one of Germany's most prominent property tech companies made the decision last year to migrate to a new CMS. The migration had two main goals: increased page speed and a future-proof, state-of-the-art website with all necessary features. The migration was initiated to allow content editors to create pages more easily without the assistance of developers. After looking at several CMS options, Contentful was chosen for its modern technology stack and superior user experience. As a headless CMS Contentful allows us to choose the rendering strategy that we prefer. To reduce the chance of large-scale problems, we're currently performing the migration in multiple stages or waves. We had an issue with the cookie consent during the first wave. This led to a visibility drop of nearly 22% in just five days. This article will describe the issues we faced during this first wave of migration and how we solved them. The first test wave is being set up We chose 10 pages that had high...