Look at this page - Slippage during copy trading
The average slippage is calculated based on statistics of trading signals execution at different brokers. Statistics is gathered for all signals at the provider's server. The difference between the order price placed by the signal provider and the order execution price at the subscriber's server is defined. The average value is calculated based on these data.
Number of slippage points is displayed according to the price accuracy (number of decimal places) at the signal provider's side.
Slippage can be caused by differences in quotes on the servers or trade execution delays. The lower the slippage, the higher the accuracy of the signal copying.

- www.metatrader5.com
Hi,
Some signals have big slippage.
Why ? Because source broker is slow to communicate open trades ?
Open trades on signal page are too delayed ?
Regards
Sergey explained about slippage.
MQL5 signal monitoring is refreshing data and open trades every couple of minutes, these details are not live.
Thank you.
Why most brokers have no slippage and other huge slippage, poor servers ?

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Hi,
Some signals have big slippage.
Why ? Because source broker is slow to communicate open trades ?
Open trades on signal page are too delayed ?
Regards