# Optimize computing time of a numerical integration?

GROUPS:
 Hi, I have the following function to integrate: Ftn[ Eo_?NumericQ] := NIntegrate[Evaluate[f1[Enu]*f2[Enu]* f3[Enu 0, 0]* gauss[Enu, Eo]], {Enu, 1, 30}] where, f2[Enu] and f3[Enu] are sum of several exponential functions with exponent Enu.This takes 40 minutes to run. Is there any other standard way to handle the numerical integration in Mathematica which take shorter running time? Thanks