Originally posted by inandlong
I just did an empirical speed test...meaning I eyeballed it - among three common quote systems being used in this thread, QT-IB, QCharts, and Esignal.
First I ran QT-IB against QCharts. Side by side using the 1 minute candle...ES and NQ. This was no comparison really, QCharts was always about 2 beats faster at least. And because of the refresh rate for QT even when set at 1, there are many ticks that don't show.
Then I ran Esignal and QCharts side by side, same setup as above. This was a much closer race. There were three main differences. 1 - In a faster market, Esignal was just a beat faster. And I mean just the time it takes to saw boom boom in normal conversational tempo. 2 - In a slower market, QCharts was always faster by that same beat or even longer. 3 - QCharts was always the first to post the opening trade of the next bar.
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Unfortunately, QC also prints a lot of phantom trades on its charts, i.e., it will show bids and asks as trades, which makes EOD chart review - much less backtesting - nearly futile.
--Db
