You have probably heard burst rate mentioned if you have visited a photography studio. It refers to the number of consecutive shots a camera can take when in shooting mode. When this mode is set, the images are stored in a high-speed memory format until transferred to the memory card. When the buffer is full, the camera reduces FPS to give it time to free up space. There are a couple of factors that affect burst rate formats. File size is one and the other is the speed of the memory card.