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Date/Time: Fri, 14 Mar 2025 15:30:13 +0000



[User Discussion] - Huge difference between replay SIM and live auto trade fills.

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[2025-02-07 11:48:53]
User666015 - Posts: 66
Hi Guys,

Hope you're well?

I have something that I don't fully understand to do with the differences between replay SIM and live order fills being very different. I understand that they will not be the same, but I cannot account for how different they are, I also understand that this may be normal with what I am trying to do, but any help/guidance would be greatly appreciated.

I am running a basic delta based auto trade strategy using Trading System Based on Alert Condition study, which are not set to Evaluate on Bar Close Only - I think this may be where the issue lies, I'm detecting small delta changes and acting quickly on them.

I have a VPS in Chicago running one very basic chart at low intervals, I've tried 10,20,30,40ms all with similar results, which are worlds apart from my SIM replays unfortunately.

I have attached two screenshots - SimReplay shows a section of chart which has been replayed and LiveOrders shows the same chart but with live orders, on this chart I have highlighted with arrows the trades that were not taken at all in the live environment.

I have read: Trade Simulation: Trade Simulation Accuracy and Bid/Ask Prices During Replays and Trade Simulation: How Orders are Filled - but to no avail.


I hope this makes sense and I haven't just rambled on, thanks in advance,
Bill
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[2025-02-07 11:59:40]
cmet - Posts: 677
Instrument?
Order type?
Trade size?
Session/Time of Day?
Amount of discrepancy?
Date Time Of Last Edit: 2025-02-07 13:01:32

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