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zebediah49 t1_ixlzunc wrote

Speed is also important. The slower you freeze something, the bigger the ice crystals, can get, and they wreck everything. It's why frozen pizza went from "trash" to "actually pretty okay" after the invention of flash freezing.

The smaller the object, the faster you can freeze it. As you try to freeze bigger things, at some point, because heat has to travel via conduction from inside to outside, you can't freeze your sample any faster.