The exploit requires pages to load instantly. The first person was saying it usually takes a few hundred ms to load a page (at least). The second person points out that you can load the page in the background so it is in the local browser cache already, in which case loading is near instant.
I understood the first comment as tongue in cheek, because the web has become very slow. It's a legitimate argument, too, but I read it as at least a bit tongue in cheek.
Neither are a joke.
The exploit requires pages to load instantly. The first person was saying it usually takes a few hundred ms to load a page (at least). The second person points out that you can load the page in the background so it is in the local browser cache already, in which case loading is near instant.
I understood the first comment as tongue in cheek, because the web has become very slow. It's a legitimate argument, too, but I read it as at least a bit tongue in cheek.