EXPERIMENTAL feature (A/B test, default OFF, outcome not guaranteed): when ON, the FIRST ~40 products of each detail batch still ride the run's shared identity on the warm page (fast harvest), and only the REMAINING products switch to brand-new independent browser identities (each a fresh browser with its own cookies and credentials). The hope is that fresh identities reduce the platform's blocking of detail requests. Trade-offs you should know: (1) each new-identity group starts ~13 seconds slower because the identity must be created first; (2) on large runs (maxResults > 40) this extra time will very likely exhaust the run's time budget — the run then ends with PARTIAL data (everything collected so far is delivered and marked partial in SUMMARY) instead of full details; (3) when the remaining time budget drops below what one identity group needs, the warm phase hands the clock over to the identity groups, and when the run-level cost cap is reached no further identity groups launch — the leftover products then degrade to card-level data (SUMMARY reports detailQuotaExhausted=true). A failed identity creation silently falls back to the shared identity, so results are never worse than with this option OFF. Leave OFF for normal runs; only enable it to compare detail quality on large batches — the SUMMARY diagnostics are the same either way. Relationship to fullDetailSharding (SFD): when SFD is active (auto-ON for maxResults > 55, or explicitly true) it OVERRIDES this switch — SFD runs the same identity machinery but with the full-detail contract (no card-level degrade, run budget raised to 780s, a raised cost cap and a shard fill loop), and this option's value is ignored for the run.