Contrary to popular belief, the microwave is not a good way to defrost food because it does start to cook the outside while the inside is still frozen. Your best bet is to place the food in an airtight zip-top bag (pressing out as much air as possible so the bag won't float). Submerge the bag in a big bowl of cold tap water.
The smaller or more separated the frozen pieces are, the faster they will thaw. So when freezing foodslike pork chops, freeze them in a single layer rather than stacked. Obviously, if time allows, defrosting overnight in the refrigerator is ideal.