Eschew performance isn't the right way to put it. React allows you to do 90% of UI work in performant ways. It has good predictable performance for the majority

Eschew performance isn't the right way to put it. React allows you to do 90% of UI work in performant ways. It has good predictable performance for the majority of work and allows you to move through a lot of simple UI tasks quickly. And spend time focusing on the performance in parts of your app that matter. The situations where you really need performance tuning are going to be unique to your specific app and data.