Pro Strong performance
The Galaxy S5 uses a Snapdragon 801 2.5 GHz CPU with 2GB of RAM and a 578MHz Adreno 330 GPU. The phone is capable of handling most software without a hitch.
Samsung also optimized software response times to touch improving the overall speed of the device. Although Samsung's sometimes extraneous software can lead to slowdowns.
Con Has bloatware and a questionable front-end interface called TouchWiz
Galaxy S5 comes with a lot of extra applications not present in stock Android and an alternative front-end touch interface called TouchWiz that changes much of the default functionality of Android.
Of the application included many duplicate the functionality of stock applications and essentially become useless taking up space and slightly slowing down the performance.