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.
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On nearly 20 occasions during the Meta cross-examination, Jones asked Kaley to look at the transcript from her 2025 deposition, which contradicted some of the responses she gave during her testimony. Many of those questions were about how a specific action by her family members or a specific experience impacted her mental health, with Kaley saying on Thursday they either didn’t have an impact or didn’t significantly contribute to anxiety and depression. Her deposition from about a year ago often said the opposite.