Load effect
Increasing feed rate generally increases material removal demand. In SiC cutting literature, cutting force increased with feed rate under the tested conditions.
For marble cutting research, feed rate was reported as the strongest factor affecting surface roughness within the experiment.
Practical use
If the wire breaks, the surface becomes rough, or chipping appears, reducing feed rate is often a first diagnostic step. But very low feed can reduce productivity and may cause inefficient rubbing rather than cutting.
A useful test plan changes feed rate in small steps while keeping records of cut time, roughness, kerf, wire wear, and visible damage.