If performance clinches the deal for you, the Galaxy S5 is one mean speed demon. Its 2.5GHz quad-core Qualcomm Snapdragon 801 processor is at the top of its game, which reflects in both real-world and diagnostic tests. For instance, the graphics-heavy Riptide GP2 racing game was smooth, with all the surface effects and shadow lighting that sticklers for detail may notice. Navigation felt smooth and fast. Apps opened without much delay, and content loaded quickly. After using the Galaxy S5 for a week, the S4 definitely felt a tick slower.