All snakes will grow at their own rate. Some will grow faster than others, some will grow slowler than others. It really depends on what it eats and how it's housed.

If you feed a snake a large food item, the snake will get larger faster. Though, you would have to watch out in case it's putting too much weight on the snake, making the snake overweight. If you are feeding your snake smaller food items, the snake will most likely not grow as much and may become underweight depending on what you are feeding it.

If the snake is housed in a rather large enclosure, it has more space to stretch out and move around. Ever since I gave my King snake a 40 gallon, he's been shedding a lot. And when I mean a lot, a mean a lot. In fact, he's shedding right now. If a snake has a small enclosure, it really doesn't have a whole lot of space to stretch out and move around so the snake will not shed as often, meaning it won't grow as fast.