I have mined out an ice biome to get wild Sleet Wheat Grain. Since I am not doing anything with it yet, I have 100 stacks of 18 in one storage compactor. Whenever I look at it, the game slows to a crawl and stays that way until I reload. This looks like a very nasty memory management bug or the like. I tried loading the grain in another compactor, same effect. Also, the grain does not stack, the stacks stay separate.
Put 100 stacks of 18 Sleet Wheat Grain in storage compactor. Look at list of contents. Attached save also has one of those, left of the mushroom farm.