There is no definitive answer to this question as it depends on a number of factors, including the type of wallpaper, the resolution of the wallpaper, the specs of the device, and how the device is being used. That said, in general, HD wallpapers can affect performance, particularly if the device is already running low on resources. If you notice a decrease in performance after changing your wallpaper, you may want to consider reverting back to a simpler image.