I guess you could test the freezer method by winding two bobbins of the same school of thread, put one in the freezer and then see which one sew better.
I remember mother freezing the dampened clothes prior to ironing and the clothes ironed much better. I know from experience with church linens that 100% linen must not be dried in the dryer, instead, put the damp linens in the freezer in a zip bag and iron them with a dry iron. NO starch. Your linen will be crisp and beautiful. Works well for cotton too. Remember that bugs tend to like starch.