When using mobile agents in distributed search, the overall performance is influenced by several factors. In this paper, we study some of them and their impact. Several experiments were carried out to study the impact of network size, network topology, and the number of agents. These experiments were performed on two well-known mobile agent platforms: AGLET (a commercial environment), and TACOMA (an academic research environment). The results shed some light on the nature of the functional dependency of performance on these factors. Moreover, the experiments show that, except for the scale, the results are platform independent.