ET Reddit Mentions | ChartExchange

I've been daytrading NQ and ES for a while now and for most of last year I had this nagging problem where my live results were running about 15-20% below what my backtests said I should be making. Same setups, same entries, same stops. I went down the rabbit hole of tweaking the actual strategy for weeks. Different moving average lengths, different confirmation signals, tighter stops, wider stops. None of it closed the gap because the strategy wasn't the problem.
What finally clicked was when I started logging every single fill price against the exact price my signal fired at. I built a simple spreadsheet, nothing fancy, just three columns: signal price, actual fill, difference. After about 200 trades the pattern was obvious. I was averaging 1.5-2.5 ticks of slippage on entries and another 1-2 ticks on exits. On any single trade that's nothing. Over 200 trades it was the entire difference between my backtested equity curve and my real one.
The backtest assumes you get the price you want when you want it. Real markets don't work like that. Your order hits the book, eats through whatever is sitting at that level, and fills at whatever is next in line. During fast moves which is exactly when most of my signals fire that queue is thinner and the slippage is worse. So my worst fills were happening on my most important trades.
Few things that actually helped once I knew what to look for.
Time of day makes a massive difference. My fills in the first 20-30 minutes after open were consistently worse than the same setups taken after 10am ET. The spread is tighter by then, the book has more depth, and the moves are less spiky. I was giving away roughly a full tick on every entry just by trading the open. Some of my best setups historically happened at open so this was a tradeoff but knowing the cost let me make that decision with real numbers instead of gut feel.
Limit orders vs market orders. I used to just market in because I was scared of missing moves. Switched to limit entries placed one tick above my signal price for longs, one below for shorts. My fill rate dropped from 100% to maybe 85% because sometimes the move just rips without coming back to me. But the fills I do get are substantially better and the trades I miss tend to be the ones that would have been marginal anyway. My win rate actually went up because I was only getting filled on the trades where price hesitated at my level, which is itself a confirmation signal.
The spread isn't constant and you need to treat it like a variable cost. During the midday chop on ES the spread sits at one tick and life is easy. During a news print or a fast selloff that spread blows out to 2-3 ticks and now your round trip cost just tripled. I started tracking spread width at the moment of entry and found that my profitability on trades taken when spread was 2+ ticks was basically zero. Filtering those out improved my overall numbers without changing anything about the strategy itself.
The practical change to my process is that I now model all my returns assuming I lose 2 ticks round trip on every trade. If a strategy doesn't survive that cost the strategy doesn't actually work, it just looks like it works in a backtest that assumes perfect fills. The real edge is whatever is left after you account for the friction of actually being in the market.
Curious how other people here handle this. Do you track your slippage systematically or just accept it as a cost of doing business?

.dark-mode .qs4TB8{ color: white; background-color: #333333; border: 2px solid white; }.light-mode .qs4TB8{ color: #333333; background-color: white; border: 2px solid #333333; }ETEnergy Transfer LP Common Units representing limited partner interestsstock NYSE

ET
Energy Transfer LP Common Units representing limited partner interests
stock NYSE