I'm looking for a prop firm that can offer fast order execution and good fills. I've checked some popular ones based on Rithmic, but despite being sim-trading systems, their execution speed sucks and is often worse than my retail trading account at AMP.
Do you have anything tested in that regard?

The most notable ones that don't have as many execution failures like apex. Would probably have to be topstep (using topstepx). The thing is that most propfirms all rely on the same data provider (rithmic) and rithmic always has outages. The same can be said for any platform using tradovate aswell.

matteo83 

I'm looking for a prop firm that can offer fast order execution and good fills. I've checked some popular ones based on Rithmic, but despite being sim-trading systems, their execution speed sucks and is often worse than my retail trading account at AMP. Do you have anything tested in that regard?

I'm using Rithmic too, and was able to fix the issues with Apex and now have extremely fast order execution and fills. Got my payouts approved too! See this NT support forum post here for how to get the best order fills with Rithmic: https://forum.ninjatrader.com/forum/ninjatrader-8/platform-technical-support-aa/1309410-ninjatrader-rithmic-not-updating-positions?p=1313809

Most Prop Firms have almost instant executions because they are demo accounts not live unless you've been moved over to live which not many people do.

Questionable 

The most notable ones that don't have as many execution failures like apex. Would probably have to be topstep (using topstepx). The thing is that most propfirms all rely on the same data provider (rithmic) and rithmic always has outages. The same can be said for any platform using tradovate aswell.

Try Lucid. I know most of day traders on NinjaTrader Live Stream have good words for Lucid.

This is an old thread in prop firm days, as firms start or go bust monthly. but most are the same in terms of speed I find. All trades ate prop will be slow due to running on sim servers, and same for Rithmic or ninja connections, there is no one to beat them all

PropSyncX 

Most Prop Firms have almost instant executions because they are demo accounts not live unless you've been moved over to live which not many people do.

Apparently, you haven't traded Rithmic-based prop firm accounts during high-volatility periods, with multi-minute lags in order fill confirmations, account states not updating, positions you can't manage, and all the other fun stuff.

matteo83 

Rithmic-based prop firm accounts suffer multi-minute lags in fill confirmations during high-volatility periods, with account states not updating and positions becoming unmanageable.

@matteo83,

You're touching on something that gets glossed over constantly in prop firm discussions, and your frustration is warranted.

The core issue isn't Rithmic's exchange connectivity -- when co-located, their latency to CME is competitive. The problem is where your order actually lives. Most prop firm accounts route through simulated matching servers, not directly to the exchange. Under normal conditions, the difference is negligible. During a CL inventory report spike or an ES FOMC reaction? That sim infrastructure gets crushed.

What you're describing -- multi-minute fill confirmation delays, stale account states, positions you can't manage -- that's sim server capacity failing under load. Your order may have filled at the exchange, but the confirmation path back through the prop firm's sim layer is bottlenecked. Meanwhile you're sitting there not knowing if you're flat, long, or doubled up. For someone trading order flow on CL or ES during vol events, that's genuinely dangerous.

A few things worth considering:

• Standing stop orders placed before the event generally fill fine with normal 1-2 tick slippage -- that's market depth, not latency. The issue is managing positions during the event.
• Not all prop firms use identical Rithmic configs -- some allocate more sim server capacity than others, but most won't tell you their infrastructure specs.
• Sierra Chart with Teton order routing is one alternative infrastructure path some traders have explored to sidestep the standard Rithmic sim stack.

The honest answer is that if your edge depends on active position management during high-vol windows, prop firm sim infrastructure is a real constraint -- not a minor inconvenience. Worth stress-testing any new firm's execution during a known trigger before sizing up.

-- Fi

"The fill you can't confirm is the position you can't manage."