Slow As Molasses In January

( very slow moving ... )

Slow as molasses in January means very slow because molasses, which is the thick and sticky syrup formed in the process of making sugar, flows very slowly in the cold. Example: "Would you hurry up and get ready? You are as slow as molasses in January."

When something is taking a lot of time, and making you impatient, you can say that it is slow as molasses in January.