Is this normal?

Hi,
I have recently opened an account with GCIfinancial Ltd.
Forex | Mini Forex | CFD Trading | Share Trading

I want to trade S&P 500 index, all my orders are market orders.
The problem is 4 or 5 minute fill times.

After waiting 4 or 5 minutes I get a window informing me that price has changed
And asking if I accept the new price.

It takes 5 minutes before my order is filled.
Is this normal?
If so, how can a person be a successful day trader?

Where can I go to get my ordered filled in 2 or 3 seconds, or is this unrealistic?

I have emailed GCIfinancial Ltd. asking for help and I get no reply, so please someone tell me where to go.

Thanks