Speed at which MT4 places orders and receives order confirmation vs. MT3 speed ??

 
Hello,

Using a MT4 demo account with InterBankFX, I noticed that MT4 places orders for execution and receives cvonfirmation of order status within about 1 second, whereas MT3 takes about 3-4 seconds ? Can you please explain to me why this is so (i.e. due to program, broker server, MT4 server, etc, etc). Will this speed difference be the same for "live" trading too ?

Thank you.

Best Regards

RJF