Hi, I'm also not quite clear whether the optimized FFTW and UMFPACK libraries are being used or required in numpy at all as show_config() doesn't report it. I see that fftw and umfpack are being used for scipy. I have attached my site.cfg. Any help would be much appreciated. Cheers, Satra ---- snip site.cfg ---- [atlas] libraries = f77blas, cblas, atlas library_dirs = C:\MinGW\lib;C:\DOWNLOADS\BUILDS\lib include_dirs = C:\DOWNLOADS\BUILDS\include\ATLAS [lapack] libraries = flapack, f77blas, cblas, atlas library_dirs = C:\MinGW\lib;C:\DOWNLOADS\BUILDS\lib # UMFPACK # ------- # The UMFPACK library is used to factor large sparse matrices. It, in turn, # depends on the AMD library for reordering the matrices for better performance. # Note that the AMD library has nothing to do with AMD (Advanced Micro Devices), # the CPU company. # # http://www.cise.ufl.edu/research/sparse/umfpack/ # http://www.cise.ufl.edu/research/sparse/amd/ # [amd] library_dirs = C:\MinGW\lib;C:\DOWNLOADS\BUILDS\lib include_dirs = C:\DOWNLOADS\BUILDS\include amd_libs = amd [umfpack] library_dirs = C:\MinGW\lib;C:\DOWNLOADS\BUILDS\lib include_dirs = C:\DOWNLOADS\BUILDS\include\UMFPACK umfpack_libs = umfpack # FFT libraries # ------------- # There are two FFT libraries that we can configure here: FFTW (2 and 3) and djbfft. # # http://fftw.org/ # http://cr.yp.to/djbfft.html # # Given only this section, numpy.distutils will try to figure out which version # of FFTW you are using. [fftw] library_dirs = C:\MinGW\lib;C:\DOWNLOADS\BUILDS\lib include_dirs = C:\DOWNLOADS\BUILDS\include libraries = fftw3 ---- end snip