Many people's annoyance at having to accept cookies when they visit a new website is an illustration of what is sometimes called the "privacy paradox". This is the seeming inconsistency between someone's stated high level of concern for their data privacy and their actual behaviour online.
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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.