Mql signal stats deviate a lot from my demo account

I have tested some signals but the performance i get are a lot worse then the results on mql. How can this be? 

If you use a different broker with different trading conditions, this could affect performance greatly.

Check the slippage tab for the best setups for copying this signal, the green and upper yellow values indicate smaller slippage and better copying, orange and red values are to be avoided.

Also ask the signal provider for advice on recommended broker/server setups.

You should avoid subscribing to signals that use small take profits because slippage could negate almost all profit in your account.