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I was looking for the SCHW price improvement numbers /saw them in thier newspaper ad , but can't find them on thier website.
They used something like 1-2,000 shares+ a market order/S&P 500 stocks+ thus making it hard to compare/LOL.
YOU could most likely average better than that with IBKR;
resting limit orders, but will miss some fills. The better the price limit the more you will not get filled.; unless the market does akey reversal\then you get more than you want]
ME, i like the IBD Investors Business Daily Rule\never quibble over a quarter + miss the moVe[{That rule actually refers to a .00.25 cents a share pay up but its for good trend ing stocks/ETFs] Another way to beat that IBKR # with IBKR/ sell/market order into an uptrend.............[EVEN though a good trender simply moved price good with market order more than ''price improvement'', but result can be better that way.]