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Essentially, they all are although plenty of controls exist for the broker to slow down executions.

if by "speed", you are interested in what is known as "scalping" (although its really "flipping", then go with an ECN for lack of slippage and honest executions.

mp

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Within the great hall at Elfinore stands a wondrous coffer, precisely four cubits square and securely latched against the outside world. Inside that repository, shut away from impertinent eyes, abides many an intriquing trading secret garnered from around the world and over the ages !

As a child, i used to watch from the darkness as the secrets were debated and annotated by the elders. No one there held a single thought of my presence -- BUT I KNOW WHERE THEY HID THE KEY !!