Matt makes good sense in his reply you do not lose current in the line but you do lose power. If your resistance is high between the battery and starter you will have more of a drop between these two points. Thus ending up with less Voltage at the starter and less power. Resulting in slower turning of the starter.
If you still have the original battery cables (I believe they were 10 gauge) in the tractor you will benefit by changing them out with larger cables 4 gauge or greater.
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