You do realize that the user does not think in CPU cycles or FPS, right? Just as the goal of lowering CPU usage or increasing FPS is to improve the emotional experience the product user, so is making sure that the visual elements are properly aligned.
As the engineer, you have been staring at the product for hours at a time and are comfortable with it, perhaps even one with it. The consumer on the other hand is likely going to spend at most a few minutes before making a purchasing decision about it, or simply hitting the back button. Thus, it is important to enchant the user from the get go.
As the engineer, you have been staring at the product for hours at a time and are comfortable with it, perhaps even one with it. The consumer on the other hand is likely going to spend at most a few minutes before making a purchasing decision about it, or simply hitting the back button. Thus, it is important to enchant the user from the get go.