What might excessive rigging tension in cables lead to?

Excessive rigging tension in cables can indeed lead to increased crew workload. This occurs because when rigging tension is too tight, it may cause difficulty in controlling the flight surfaces. The flight crew may need to exert more effort to compensate for the increased rigidity and resistance, which can make handling the aircraft more challenging. Additionally, if the rigging is not set correctly, it can lead to unanticipated aircraft behavior that requires more adjustments during flight, further contributing to crew workload.

The other options are less relevant because excessive tension does not enhance engine performance or improve aircraft efficiency; rather, it can create operational inefficiencies and stress on the aircraft systems. Likewise, increased rigging tension is unlikely to reduce maintenance intervals; in fact, it could lead to more frequent maintenance due to the potential for accelerated wear and tear on components that might be under excessive stress.