For the last 5 years, I've had just about every variety of iPhones and Galaxy lines, starting with the iPhone 5 and the original Galaxy Note, respectively. What I've noticed is that the Galaxy models all seem to be faster and operate much smoother, along with more features, than the counterpart iPhone for that generation. However, in each case, the Galaxy models all eventually start getting sluggish and the battery drain becomes alarmingly serious. Moreover, they all started building too much heat, to the point that I would freq get 'cooling down' warnings, and I would have to restart my device much more frequently due to the constant and growing system lag/freezing. The iPhones I've had, all the way to the 6S that I currently have, never had these problems, and wouldn't slow down or freeze/lag even when I'm at the limit of my storage space! Which is why I was always able to load more apps on the iPhone than the Galaxy brands, even though the Galaxies all had more space (via SD card). I know that the Galaxy line has better specs, more memory, processing power, screen resolution, etc., than the respective iPhone for that generation, but why do they all, up to the S6 line which is my most recent Galaxy phone, all seem to suffer the problems I described above? Anyone else experiencing the same? Is it related to how each hardware is optimized for the OS?