Quote from 40yotrader:
The only order you can use in automated trading is the stop order. Market orders in realtime are delayed up to 5 sec. due to Tradestation processing so you can't count on the fills looking like historical results. Also limit orders are useless. There is no way to simulate the real world fills. Only sure way to have a fill is to trade through a price. The simulation will give it to you if price touches the limit. In real world you can sit in a queue and maybe get filled at the limit price. Since you want the sim and real trading to be equal forget about using limit orders.
You've got to paper trade the strategy and look for logic errors such as placing a buy stop when the price has already gone above the target price. In the simulations it'll be filled as a market order. In the real world the trade will be rejected.
You won't really be able to leave the system alone because your internet connection can be disrupted at any time (power brownouts, ISP hiccup, timeout disconnects at the broker side, the broker server going down, data feeds losing connectivity are some of what I've seen). So, the only real benefit to pure auto trading is it gives you some hands free time to do other work.
Also, you'll see times when you use a trailing stop and it should generate a cancel order on the old stop. Sometimes you'll be left with multiple stops because the old order wasn't cancelled.
Just some of what I've experienced.
43yotrader
Some of your statemnts are True, and some are not true:
-5 second delay in Tradestation might happen due to
sometimes laging data, Not because of Tradestation
processing of your strategy orders, and this downside
should affect you if you are extreem scalper only
Don't forget somthing like X-trader also can cost you
$800 a month for trading two simultinous markets,
(No ability to trade stocks also) while Tradestation 8
is almost free product today
-You don't have to place simulation type (software side)
orders, native orders for trailing stop (profit taking)
only, then you are not bothered if your other stop loss
orders are still active, unless they are reversing type
orders.
Meantime with ES, NQ, YM tick size today, which used to
be for many years ago, when volatility was much higher,
I don't think most traders can't scalp today, unless CME,
CBOT decreas Tick sizes, lets say ES=$4, NQ=$3, YM.....