Quote from xednise:
Watch out for the dead lag on the ES at times.
Quote from eSignal Support:
Do you currently subscribe to eSignal? If so, you should be on the latest 10.5 and reports of slow or lagging ES quotes is a thing of the past. I've seen similar reports on just about every platform out there at one time or another but I think you'll find eSignal is as fast as any provider out there now.
Thanks.