我已经实现了一些屏幕截图代码，可以在这里查看
我正在使用本文中的 GetTimeInNanoseconds
该函数每 100 毫秒调用一次。我已经计时了执行部分功能需要多少毫秒，即：
screenShotStart = GetTimeInNanoseconds();
CGImageRef image = CGWindowListCreateImage(rect, kCGWindowListOptionIncludingWindow|kCGWindowListOptionOnScreenBelowWindow, 0, kCGWindowImageDefault);
CGImageRelease(image);
screenShotStop = GetTimeInNanoseconds();
screenShotElapsed = screenShotStop - screenShotStart;
/* Current Delta Time */
screenShotElapsedF = ((float) screenShotElapsed)/1000000.0f;
/* Smooth Delta Time */
screenShotTime = 0.9f*screenShotTime + 0.1f*screenShotElapsedF;
下面的时间测量显示了结果。我很惊讶它有多慢，我想知道为什么。有经验丰富的 Cocoa/Core Graphics OSX 开发人员可以向我解释吗？并可能告诉我应该如何修复它？
Smooth ：以毫秒为单位的平均增量时间。当前：最新、最新的增量时间（以毫秒为单位）。
Screenshot profile : 0.242122ms (smooth) | 2.421224ms (current)
Screenshot profile : 0.970972ms (smooth) | 7.530621ms (current)
Screenshot profile : 1.421471ms (smooth) | 5.475956ms (current)
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Screenshot profile : 404.271606ms (smooth) | 209.653427ms (current)
编辑：下载配置文件结果