I think such slippage sizes are due to illiquid market or delays on your server side. On my real account at Lmax MT4 broker, the average slippage rarely exceeds 1 pips.In the first screenshot, the table that is on the graph. It shows the slippage information. Also in the second screenshot, the log. You can find it on the Expert tab of your trading platform.
This is one of the latest trades from my real account. You can see in the screenshot,
Slippage = 3.1 pips
Profit is 4.4 pips.
In case slippage was 0, I think the profit would be equal to (4.4+3.1) 7.5 pips.
Slippage takes away some of the potential profit and has a negative impact on the result. That's why I now only use powerful VPS servers in my trading, which are in the same data centre as the broker's server. This gives me the best results.
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Try to optimise your server. You might want to consider a more powerful processor for the server.