渲染器：剧院的灯光和特效组。它负责把脑海中的画面画到屏幕上。
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英國超市將巧克力鎖進防盜盒阻止「訂單式」偷竊，这一点在91视频中也有详细论述
Finding these optimization opportunities can itself be a significant undertaking. It requires end-to-end understanding of the spec to identify which behaviors are observable and which can safely be elided. Even then, whether a given optimization is actually spec-compliant is often unclear. Implementers must make judgment calls about which semantics they can relax without breaking compatibility. This puts enormous pressure on runtime teams to become spec experts just to achieve acceptable performance.