[guywithabike]

Incorrect. You see a flash because the new image has't been loaded yet, but all the other images have been previously loaded and cached, so your browser can display them almost immediately.

Try going back to page 1 — each page will appear to load instantly if you have all the images cached.

[MrBuddyCasino]

With Chrome on OSX I can see what he means - "new" (but already cached) pictures still flicker, the old ones do not. So it can't be caching.