In this paper we present a computational method to calculate the poten
tial of long-range interactions between particles which allows conside
rable saving in computing time. The method is based on the tabulation
of the potential due to particles located on a sufficiently accurate 3
D grid. The actual potential is evaluated by a three-linear interpolat
ion of the tabulated values. The validity of the method is proved thro
ugh a Monte Carlo-Metropolis simulation of ionic fluids. Finally, the
speed-up achieved executing the method on different workstations is sh
own. (C) 1998 Published by Elsevier Science B.V.