I would say they all can be fast. But try browsing the web on a low end Android device and tell me all sites are fast. To my mind the differentiator is how easy a framework makes it to shoot yourself in the foot. And React makes it very easy to re-render a huge swathe of your app when you've only changed one tiny element. React also needs to hydrate every element even when it isn't ever going to change, which usually involves parsing some JSON payload for props on page load.
None of this is world-ending stuff. But it is very easy to keep putting wonderful, carefully crafted components together and not realise the entirety of what you've made is getting slower and slower over time.
I would say they all can be fast. But try browsing the web on a low end Android device and tell me all sites are fast. To my mind the differentiator is how easy a framework makes it to shoot yourself in the foot. And React makes it very easy to re-render a huge swathe of your app when you've only changed one tiny element. React also needs to hydrate every element even when it isn't ever going to change, which usually involves parsing some JSON payload for props on page load.
None of this is world-ending stuff. But it is very easy to keep putting wonderful, carefully crafted components together and not realise the entirety of what you've made is getting slower and slower over time.