The Shaddow DOM
The biggest buzzwords surrounding React is “The Shaddow DOM”; I always think it sounds like something Sauron in Lord of The Rings could have made. It is the thing a lot of people believe will solve every problem they have with performance with their current setup.
The reality is that it makes some stuff faster, and there are good ways to solve most performance problems with React. But I think that you are probably not doing it like you should or in the most optimized way, if you have a lot of performance problems.