Many "pro" custom highway designs strip away unnecessary background elements, offering a clean, matte finish. This design choice minimizes visual noise from the background video, allowing the player to focus solely on the note stems. The default highway, while simple, does not offer the optimized color palettes that competitive players prefer (such as the popular "note streak" counters or transparent highways).
To ensure your custom highways look their best and don't cause performance issues, follow these standards: custom highways for clone hero better