The INP observer sorted Object.values(interactions) on every event entry,
even though metrics.inp is only read when sendPerformance() flushes.
Defer the sort + p98 computation to flush, and drain queued observer
entries via observer.takeRecords() to capture the most recent
interactions on pagehide/visibilitychange.
Output is identical (same INP value computed). Savings are largest on
interaction-heavy pages and low-end devices where the per-event sort
compounds.
Stanislaw
3f9de35907