Article
Why Replay Results Fail Live: Modeling Partial Fills and Queue Position for Technical Traders
Separate strategy edge from execution friction by modeling partial fills, queue position, and slippage.
Replay assumes clean fills, but live execution includes queue pressure, partial fills, and variable slippage. This guide helps technical traders model those differences before they misread strategy quality.
Short Answer
Replay outcomes fail live when execution friction is ignored. Model partial fills, queue position pressure, and slippage per setup so you can distinguish strategy quality from execution degradation and avoid false assumptions about edge decay.
How do partial fills distort replay expectancy?
- Replay often assumes full size at ideal price.
- Live partials reduce realized edge and management flexibility.
- Queue pressure can delay fills beyond optimal trigger conditions.
What execution fields should be tracked?
- Expected fill price versus realized fill price.
- Fill class: full, partial, missed, or delayed.
- Slippage bucket and queue-pressure context tag.
Common Mistakes
- Treating every poor live result as strategy failure.
- Ignoring missed and delayed fills in review datasets.
- Using replay expectancy without execution haircut assumptions.
Next Step
Audit your next 30 live trades and compare replay expectancy to friction-adjusted expectancy by setup type. If you track expected and actual execution fields in structured records, fill-quality drift becomes measurable instead of anecdotal.
MyLinedChart can preserve setup context with execution notes, and consulting can help connect this to broker-level performance audits.
FAQ
Can replay still be useful with fill limitations?
Yes, if you apply realistic fill assumptions and compare friction-adjusted outcomes rather than idealized fills.
How many trades should be sampled for fill analysis?
Use at least 30 trades per setup family for meaningful execution-friction comparisons.
What should be fixed first?
Fix execution assumptions first, then decide whether strategy logic truly needs changes.
Sample MyLinedChart Multi-Chart Exports With Drawings
- Download Sample XLSX Export (.xlsx)
XLSX and CSV are streamlined for human reading. Use spreadsheets for direct review and journaling.
- Download Sample JSON Export (.json)
JSON keeps full technical details. JSON sample for structured automation, backtesting prep, and pipeline ingestion.
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