Yes, you can cool a candle fast(er) by keeping the ambient temp of the room cooler, putting it in an "ice chest" (Styrofoam) or putting it in the refrigerator. I do this a lot with my pillars, and especially with my hurricane shells, otherwise I would have to wait way too long to take it out of the mold, It also helps the candles release from the molds. Containers, I really don't do this with, because IMO it's not needed and it actually benefits the candle (my blend anyway) to cool them slowly.