Hi. I have a Canon Ixus 120IS. I'm a bit disappointed with it because it's so slow in taking pictures. When I click the shutter it takes awhile and after taking the picture there is still a lag before I can take another picture. In the future I would like to avoid making the same mistake so my question is how do you call this spec of the camera so that when I look at reviews I will know that it's a slow one. What kind of speed is it? Sorry I'm not familiar with photography terms. Thanks.