How does the cache system work these days?

Explanations of how the SL cache works these days would be greatly appreciated.

I am motivated to ask this because I read that we now have an unlimited texture cache size. I however see gray where textures ought to be over and over and over for the same objects, same textures, same sims. Seems to me that with an unlimited texture cache one might expect to not see too many greay textures because there would be no need to acquire texures you'd already seen.

seems about the same to me, evey login i have to re-download my workshop ... eventho i was just there (lets say) 20 min ago