I've recently started using scipy.ndimage.filters.convolve instead of scipy.signal.convolve2d as I've found that is significantly faster. The only issue I've found to convolve is that it doesn't have ...

I worked around some cases in #3664 but in #5608 noticed some cases are still extremely slow. convolve() takes 4000 times longer than outer() though they are identical operations: a = rand(1000, 1) b ...