Mobile: Is it bad to implement a tab-like system that open different pages?

In a mobile website (m.domain.com), as the page load time could be a number 1 problem, isn't this a bad way to implement?

Here "Profile, Claps, Highlights and Responses" tab-like links on Medium opens different pages (They are used as swipe tabs in mobile app version).

I think it's a better way to load the related content as nobody likes waiting or unless the content doesn't have an infinite scroll, that is limited content, then is it a good way to implement one page style links which is sticky?