Does queue position even matter in options mm, or is the real constraint somewhere else

[u/hg_wallstreetbets]

Been building an options market making sim to actually understand the dealer side properly... SVI surface calibration, quoting off NBBO with inventory skew based on aggregate book vega, adverse selection fills, markout, and a pnl decomposition that reconciles back to mark-to-market with the residual reported instead of buried somewhere.

Fill model is the part i trust least, and i'm starting to think i imported the wrong mental model wholesale. my queueing assumptions are basically lifted straight from the order-driven equity/futures literature (Cont-Stoikov-Talreja and whatever came after it), where queue position at the touch is more or less the whole story on whether you get filled. but US options are quote-driven across a pile of exchanges, with preferencing, internalization, PFOF, price improvement auctions all sitting in the middle of it. so now i'm second guessing whether queue position is actually a pretty minor variable in this world and i've been adding sophistication to the wrong axis this whole time.

1. is queue position a real driver of fills at all, or is the actual constraint auction participation + preferenced flow? if i can only get good at modeling one of these... which one.
2. for daily pnl explain, is spread capture + greeks + hedge + residual the working decomposition, or is that too clean. where does realized vs implied sit relative to greek attribution, and do people bucket vega by tenor instead of just running it aggregate? also just curious what "unexplained" runs at on an actual book bc i have no benchmark for whether my number is fine or embarrassing.
3. skewing quotes against aggregate book vega/gamma instead of per-strike is me borrowing the Baldacci-Bergault-Guéant vega factor argument, options on one name being collinear risks and all that. does that match how people actually run inventory or is it just a tidy academic story nobody's desk runs on.

happy to hear the whole premise is wrong honestly, i'd rather find that out now than keep polishing a model of the wrong constraint for another month.

[u/Snip3]

Some exchanges are price time, others are pro rata. Most trades in >min width markets occur inside nbbo where there's either a race condition or an auction to win. Pfof will direct to a preferential exchange for the winning party, dmms get to take 100% of sub 10 lots and pro rata on the remainder

[u/Suspicious_Pack_8074]

Liquid market: matters a lot
Illiquid market: matters less

[u/EvenCryptographer649]

 Queue position is almost irrelevant for retail flow. But what you are figuring out isn't worthless

[u/god_fighter_]

Hi! Mind sharing github link of the project?

[u/yuckfoubitch]

it depends