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.
全面建设社会主义现代化国家，“最艰巨最繁重的任务仍然在农村”。，这一点在旺商聊官方下载中也有详细论述
The hours that led to bloodshed。谷歌浏览器【最新下载地址】对此有专业解读
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