Quote from market_hacker:
yes your broker can make a difference in speed due to the quality of their IT staff, the number of traders you are sharing exchanges gateways with, etc....
The person that recommended looking at the audit trail to measure performance gave you good advice.
the log will show two kinds of messages which you can use to measure performance.
when you click to enter an order you will first see and ACCEPT message. This basically means that the TT gateway has received your order and is going to try to send it to the exchange. next you should get an OK message indicating that the exchange has received your order and everything is ok. (you might get REJECT if there is something wrong with your order)
The people that gave you advice sayijng that latency (round trip time) is more important than bandwidth are correct in general, though the CME price feed is notoriously noisy so you'll need at least 1mb.
the fastest most reliable method to trade through a broker's gateways is to get a direct line to them (not across the internet)
second choice would be use something like radianz or yipes.
the fastest way period is to set up your own TT gateway in your house and have a line directly to the CME but this is out of reach for most people trading from home but i don't like to make assumptions about people's resources.
i hope that helps