I don't intend to hijack frost's thread at all... that type of stuff happens way too often in this forum.
Frost, the variance between your IB walk-forward and real execution must be somewhere in the translation of real money execution = slippage versus demo mode. Based on what you say, there can be no other reason.
I wrote many systems which legitimately averaged $50 per trade over five years' time. But... back out -$10 per trade slippage on each turn and -$10 per trade bid/ask in the ER, we've lost -$30 of the +$50 hypothetical profits.
That will change the equity curve in dramatic fashion, unbeknownst beforehand.
From what you say, IB's difference between sim and reality is the chasm of death for your bot. If your system averaged $120 per trade, it would likely hold up thru the difference. That's one of many reasons why pure intraday bots designed by retailers like us won't hold up... the big pros are driving Ferraris while we sputter along with Hyundais. <b>Steve46</b> has earlier mentioned the difference between retail and institutional bots... light years apart.
That's pretty much all I have to share on this topic here. I found system trading to demand far more time, focus, study, work and emotional drainage than discretionary trading.
I learned a tremendous amount about how markets really work thru my time spent in bot-world. It might have made the difference between success as a discretionary trader and failure for me, in all honesty. Some of the surprising lessons learned building & breaking down systems in years past are foundations of how I view and approach market action today.
No regrets, just a path I've long since left. Best wishes to all those who prefer that style of trading
