CLS at BuzzFeed — Part 2: Getting help from real users

CLS at BuzzFeed — Part 2: Getting Help From Real UsersIn Part 1 of this series we detailed our initial approach to reducing our Cumulative Layout Shift scores and reached the stage where our synthetic tests were all passing yet our Real User Monitoring (RUM) data showed only ~50% of users were getting a “good” experience.Synthetic Tests are all passing.Real User Data is less impressed.At this point, we’d fixed all the obvious issues and exhausted our ideas for which parts of the site to next inv...