As the marketer for SellYourCar.com, the user experience for the site is Olivia's responsibility. She enjoys creating rich, impressive content that creates a welcoming environment for users. But the slow performance of the site frustrates her. What's a factor that's likely slowing down the performance of the website?

Videos are a common culprit for slow website performance due to their large file sizes, which require more bandwidth and time to load. While they can enhance user experience, poorly optimized or numerous videos can significantly degrade site speed. XML and HTML are markup languages that structure web content; their file sizes are typically small and do not inherently cause slow performance. Localization refers to adapting content for different regions, which doesn't directly impact site speed unless it involves loading excessive new resources.