在以软件模式呈现时，遇到的最大的性能问题与填充率有关，该值定义为呈现的像素数目。
The biggest performance issue you will encounter when rendering in software mode is related to fill rate, which is defined as the number of pixels that you are rendering.
新建一层，画一个像素高度的选区，从层中间位置开始用白色到透明的颜色值拉一个径向渐变填充。
Create a New Layer and make a selection 1px height and fill it with a Radial Gradient, White to Transparent, starting out from the middle and deselect.
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