no it's not. it's very hard to write a slow application if you know the minimum about how the browser/vm handles your data.
very few cases excluded (e.g. scrolling issues on Android of old) it's nothing but a case of bad developers not having a clue. their code will be slow regardless of the framework because they use the wrong data structure, or render on the wrong step. simple as that.
then changing framework means dropping several features until they are ported, which means less code, which means faster code... until all features are back in. then, rinse, apply framework du jour, repeat.
