How does YSI Hooks work internally? Compilation vs Runtime and Performance Impact

Hi! I’d like to better understand how YSI's hook system works under the hood.
Are all hook functions combined during compilation, or does the system iterate through each hook one by one at runtime (like a chain)?
Also, is there any noticeable performance impact when using multiple hooks on the same callback, such as OnPlayerKeyStateChange?
Thanks in advance, and great work on the library!

@Y-Less