what actually changes about broker choice once youre trading serious size

[astroshade]

fill quality over spread is the whole graduation. at size you also start feeling the difference between true ecn routing and an internal b-book that handled your small orders invisibly but balks at a real one. the broker that felt identical to others at micro lots reveals its real nature when the order is big enough to matter to them.

[charliebrown]

serious size in retail forex usually means someone went from 0.1 to 1 lot and now thinks theyre moving markets. unless youre trading dozens of lots the liquidity is fine and youre overthinking it to feel professional.

[darkhorizon]

theres a real threshold and the troll is right that most people overestimate where they sit relative to it. on majors youre nowhere near moving the market until youre quite large. but the broker-side handling, b-book balking, requotes appearing, slippage creeping in, can start well before you actually strain market liquidity, because its about the brokers risk appetite for your flow, not the market depth. thats the nuance.

[itsliam]

how do you even test how a bigger order fills without risking a real bigger order to find out the hard way?

[tylerg]

scale up gradually and log fills at each size, dont jump. track your average slippage per trade as size increases. if slippage stays flat as you grow, the broker handles your size fine. the moment average slippage starts climbing with size, youve found that brokers comfort ceiling for your flow. let the data reveal it incrementally rather than discovering it on one oversized order.

[ghostknight]

logging slippage versus size is exactly it. ive got a simple chart of average slippage by lot size per broker and it instantly shows which one to route bigger orders through. completely changed broker choice from a reputation guess into a measured routing decision.

[dreamchaser]

one more that climbs the list at size: withdrawal speed and limits for larger amounts. small withdrawals clear easily everywhere, large ones expose which brokers have real banking depth and which start asking unusual questions or staggering payouts. at size, getting money out smoothly becomes as important as getting filled smoothly.

[Nathaniel]

plot twist, the broker that gave you flawless fills and instant withdrawals while you were small does both worse once you actually have money there worth keeping. funny how that works.

[Ryan]

which is the argument for proving withdrawals and fills at your new size before concentrating capital there. dont assume the small-account experience scales. test large withdrawals while you still have an easy exit, and keep a second broker proven at size so youre never trapped if the first one degrades as your balance grows.

[Cody]

fill quality and withdrawal depth over headline spread. agreed.