For those who trade with high volume of contracts
What's the largest amount of contracts you can trade NQ and ES without any slippage?
I think NQ does suffer from liquidity issues during the overnight trading hours. However during the first hour of the regular trading hour there should be no issues to almost any quantity in either commodity.
I usually use STL +1 (stop limit orders with 1 tick limit) and get filled 99.5% of the time in NQ. ES has never been an issue.
For those who trade with high volume of contracts
What's the largest amount of contracts you can trade NQ and ES without any slippage?
seems like you are having irrational fear.
You should have traded with a small quantity and experience slippage for yourself.
Not sure how big you trade, but I can tell you from experience the bigger you trade the more likely you'll experience severe slippage or even risk not get filled if using a STL with a short stop limit ESPECIALLY during non peak overnight hours.