Two petitions, same sport, same month, different service centers — different questions, different tempos. Filing volume across the centers is the only way to know this; this page is that knowledge written down.
USCIS assigns O and P petitions by workload-balancing rules the agency adjusts periodically — filers follow the current form instructions and lockbox addressing, and the receipt notice tells you where the file landed. The practical point: you do not choose, and planning must work with either draw.
Divergence is real and it is QUALITATIVE — patterns practitioners see across volume, not statistics anyone can honestly print. What varies in our filings' experience: the flavor of RFE questions (itinerary formalism versus recognition-standard probing), tempo outside premium processing, and how boilerplate versus bespoke the requests read. What does not vary: the regulation itself. A petition built to the checklist's standard is built for both buildings — and that, not center-guessing, is the strategy.
Premium's 15-business-day clock applies wherever the file sits — it is the great equalizer of center tempo, and the reason the four-clocks page treats center variation as a planning footnote rather than a headline. What premium does not equalize: the RFE-style differences, which arrive on the same fast clock.
Files transfer between centers when workloads rebalance — a transfer notice is not a problem sign, and the legal posture follows the file untouched. Status language ("case was received," "actively reviewed," the RFE trio) means the same thing everywhere; the meaningful signals are the dated notices, not the portal's mood. Keep every notice — the receipt trail IS the timeline evidence.
Center tempo explains weeks; it does not excuse quarters. When a file has outrun posted times and inquiry responses have gone template-shaped, the escalation ladder runs through the firm's congressional practice and, for files that have genuinely stopped, the federal-court lane. RFEs and denials have their own pages — a slow center is neither.
Bring the receipt notice — the consultation reads your file's actual posture, not the portal's weather. A $500 consultation with Sherrod Seward covers your specific facts — credited toward the fee if you retain the firm.
No — assignment follows USCIS's own routing. Energy spent center-shopping is better spent on the filing quality that performs at either.
Anecdotes compare different files, seasons and workloads. Premium processing is the honest speed lever; the four-clocks page prices it.
The filing date and legal posture travel with the file. Practically, transfers can add handling time — another argument for filing early per the renewals page's calendar.
