该测速工具延续了系统级应用的简洁风格，界面动画流畅，无任何广告干扰，相比市面上第三方测速 App 更加轻量、直接。
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For implementers, this promise-heavy design constrains optimization opportunities. The spec mandates specific promise resolution ordering, making it difficult to batch operations or skip unnecessary async boundaries without risking subtle compliance failures. There are many hidden internal optimizations that implementers do make but these can be complicated and difficult to get right.
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