What is the fastest stock trading platform that I can?

E.g., I will be trading penny stocks (- stocks), so I need to be able to if not instantly, very quickly buy and sell shares of a company.

Suggestions?
I realize the risk, and I also realize that cost per trade isn’t a big issue when you deal with 1000+ shares at a time, so don’t feed me that. Anyways, I hear Lightspeed is pretty good. Anybody know of it/use it?

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Filed under: sell my timeshare