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.
alpha测试无法避免的，你应该保持整体可见alpha 测试的像素数目减少到最低。
Where alpha-testing cannot be avoided, you should keep the overall number of visible alpha-tested pixels to a minimum.
数字图像由于其分辨率高、像素数目多，存储时所需的容量相当大，而且要得到平滑连续的画面效果，对速度的要求也是相当高的。
Because of high resolution rate, great amounts of pixels, enormous memory capacity is necessary, and smoothing continuous image makes high speed a must.
数字图像由于其分辨率高、像素数目多，存储时所需的容量相当大，而且要得到平滑连续的画面效果，对速度的要求也是相当高的。
Because of high resolution rate, great amounts of pixels, enormous memory capacity is necessary, and smoothing continuous image makes high speed a must.
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