DislikedI use a VPS with a good connection. It ranges between 200 and 1000 ms between order submission and order execution. Sometimes it takes over 2 seconds but this is very rare. Mostly around 500 ms.Ignored
For comparison I have a ~30ms lag. I don't know what's your ping to IB server but it would be a good comparison if you could post the ping and ammount of negative, positive slippage for IB and dukascopy.
Hope my reasoning helped.