The iPhone 5s runs Apple’s A7 chip, which the company claimed was twice as fast as A6 but is hamstrung by paltry 1GB RAM. You’ll notice this the moment you open a few tabs on Safari and try switching between them. Some of them will reload the entire webpage as the device doesn’t have enough RAM to keep those tabs in memory.
While it probably is unfair to expect super-fast performance after using a phone for so long, new users will also experience the same minor lags that we do. Apps launch just a shade slower, and some, such as Facebook, take a lot longer to load content. When we launch Facebook, we often see the blue top bar and white background for a few seconds before the app starts responding. So far we haven’t faced any lags or freezes while playing games.