I used Lightspeed and for the most part the platform is great. Having said that, during seriously high volume times when things are moving incredibly quickly (big news pieces, some sort of announcement) it can take as long as 5 seconds to get a fill and that's simply unacceptable. Are there any platforms that are best for trades when the market or an individual stock is moving extremely quickly? Or is there a reason why the fills take so long in quick moving times? Thanks so much