In LIA, the best solution obtained using FA is modified by increasing load in small steps on PQ buses. The step size of incremental load affects the computational time and quality of solution. If very small step size is considered, time for solution increases. On other hand if step size is high, the solution obtained using FA is not modified significantly. In this paper, load incremental step is varied from 0.01 to 0.00001 which results δ=0.001 as most suitable step size for load increment in LIA algorithm.