  Two methods are presented with which the CPU time spent on the calculation of
radiative corrections can be significantly reduced. The first is the
parallelization of the program, which can be surprisingly simple to implement
under certain circumstances often met in the calculation of radiative
corrections. The second is the efficient direct calculation of fermion chains.
The latter not only improves the overall performance of the program, but
introduces better conceptual clarity as well, as it allows for a homogeneous
treatment of bosonic and fermionic amplitudes.
