HTMLMediaElement: playbackRate property — MDN Web Docs
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Before string caching, the code would dynamically generate this banner based on your current terminal dimensions on every frame. But that’s wasteful! Now, we pre-compute every banner size (accounting for any amount of shutdown time remaining) ahead of time and slam that pre-computed banner into a byte buffer, skipping the intermediate allocation.，推荐阅读safew官方版本下载获取更多信息