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Diagnoses forced synchronous layout from interleaved geometry reads and style writes, then batches work and reduces its scope.
Explains DOM and CSSOM construction, style, layout, paint, and compositing as a practical performance model.
Chooses browser storage by server transport, lifetime, capacity, query needs, sensitivity, synchronization, and offline behavior.
Diagnoses incompatible cached HTML and immutable assets across CDN, browser, service-worker, and rollout boundaries.