Unless the article of the linked website, which you do present here word by word, shows a minimum amount of detailed and meaningful "performance" metrics of 2 to 3 real world use cases, including theirs project structure/architecture and implemented code, your contribution here (as much as the article there) is just a bunch of unbacked (personal) opinions; thus, it's entirely useless. In addition, the term "performance" gets used a lot, but remains fuzzy due the lack of an exact definition what performance, when it comes to the comparison of JS vs TS, actually is/means.