Your body will decide how fast it wants to release the weight. To give an example, when I was losing my weight initially my losses (if I recall correctly) 8lbs in the first week, then 4lbs forever and a day it seemed, and then for no reason whatsoever my body dumped 11lbs (more than my first week) in one week, and then went back to 4lbs again. That is the first thing - the body is a clever but strange machine.
Apart from anything else your losses come down to basic maths, physics, and facts.
First, you have a BMR (Basal metabolic Rate) that can be different for everybody. This BMR defines how many calories your body needs, in a sedentary mode, to remain at exactly the same weight. Any movement, activity, exercise increases your calorie needs.
Second, your weight loss is controlled by your calorie defecit, the difference between the calories you need to the calories you put in. Put in less than you need you lose weight. Put in more than you need you gain weight.
Third, a pound of body fact equates to approximately 3700 calories. This means that is you run at a calorie defecit of 3700 calories a week you will lose 1 pound a week.
For example, an average man needs around 2,500 calories a day. Put him on CD SS and he is getting around 500 calories, so he is at a daily calorie defecit of 2,000 calories. Over a week that is a 14,000 calorie defecit - a weight loss of around 3.78lbs .....
It could just be that your calorie defecit is a little lower. If you increase your exercise then your calorie defecit will increase, and so will your weight loss.