How much latency is too much for day trading?

george_the_second said:
Ah, yes, I now remember reading about that, thanks

They do mention that there is a distinction between market data and tick by tick, and the latter is available in the time&sales window starting with TWS v969.
https://interactivebrokers.github.io/tws-api/top_data.html

In any case, to broaden my perspective, do you have any recommended alternatives for affordable tick streaming data? I have seen IQfeed mentioned in another post.
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I'm using IQFeed (their API), along with IB for the trading part, and it works well. Stable, fast, no substantial lag.
 
Moving to a button and clicking takes 250-500ms, which is significant relative to what happens after. Also I think IB says it takes about 250ms to get your order from IB to the exchange (depending). Then you get in line for LMT orders. These are things that you can optimize. Hope that helps your trading.
 
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