Again, in my opinion you approach the problem like a power user. Using a browser is not a speedrun where every millisecond matters. Here is why I think it provides more comfort to an average user:
No need to divert attention and look around the monitor. When you’re not well versed with a mouse, it’s easier to click and look at the same place
Nothing distracts you unlike when you click through pages. Imagine going from dark theme page to a light theme page, the entire screen suddenly lights up
Depending on the way it is implemented (perhaps by keeping compressed page screenshots?), it might be faster to show a preview than to render the page again on a weak machine