This is probably a interference of a chosen output method and a system compositor behavior (or its recent changes). Compositor redirection broke synchronization

This is probably a interference of a chosen output method and a system compositor behavior (or its recent changes). Compositor redirection broke synchronization for most old code, and available interoperation and bypass methods have been changing with time. This was the reason media players and games introduced new fullscreen modes. Players, including VLC, have been capable of stutter-less video output for decades, the problem is that there is usually more to show on screen than just the video, and the user wants other things to happen in parallel. It's true that VLC requires arcane knowledge of its architecture to configure all of its options, but basic operation still assumes you've read the fine manual.