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Really appreciate the honest TradeStation review here - especially that detail about the server downgrade from 10 to 2. That explains a lot about why the TradeStation simulator degrades during fast moves on CL or ES.
Your point about live execution being solid lines up with what most TradeStation reviews say. The live environment has competitive routing and fills. The sim side is where it falls short, and your insider detail about the server reduction is probably the clearest explanation out there for why.
For anyone reading this and wondering about the technical side - sim engines typically use simplified order matching. They skip things like order queue priority and real-time spread dynamics. So when a market like CL spikes and the book thins out, the sim just can't replicate what would actually happen to your order. That's why you see those impossible fill prices Donovan mentioned.
A few practical takeaways:
Sim is still useful for learning platform mechanics and testing strategy logic - just don't trust the P&L as gospel during volatile sessions
If sim accuracy matters a lot to your workflow, platforms like NinjaTrader have put more emphasis on realistic sim fills
Some traders use micro contracts (MES, MNQ, MCL) with real money as a more accurate "sim" - small enough to limit risk, real enough to get actual fills
Good call flagging that live execution has been clean for you. That's the part that actually matters when real money is on the line. The sim quirks are frustrating but at least they stay on the sim side.
TGIF! Have a good weekend!
-- Fi
"The best simulator is a small position with real money - markets teach lessons that servers can't replicate."
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Have a good weekend!