When I visit an http page for the first time and then exit. When I re-enter after 2s, I see that the pages are displayed faster. webkit's net threads are caching them? Where should I find out and how long are they cached for?

Why does iOS have swap memory size? According to my understanding, iOS only has memory compression, not swapping, what does swapping mean here? One more question, does memory compression only compress dirty memory? My understanding is that for dirty memory, it is compressed, and for clean memory, it is directly page out to the outside.