“Fiber is reimplementation of the stack, specialized for React components. You can think of a single fiber as a virtual stack frame.”— Andrew Clark, github.com
“When dealing with UIs, the problem is that if too much work is executed all at once, it can cause animations to drop frames and look choppy. What's more, some of that work may be unnecessary if it's superseded by a more recent update. This is where the comparison between UI components and function b…”— Andrew Clark, github.com