The commission calculation is incorrect in the performance backtester.
In the attached screenshot (and example), I've set the commission to $2.70 a side and the default trade size is 25 lots.
The commission I should have paid is: 373 trades x 2.70 per lot x 2 (round turn) x 25 lots per trade = $50,355 NOT $2,014.20. The $2,014.20 number only qualifies if you are trading 1 lot and not 25 lots (in this example).
Cheers.
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