filling is slower with numpy 1.15

[imandr]

It looks like histogram filling is about 10 times slower with numpy 1.15 than with 1.13

[imandr]

The histogram is simple 1-axis like this: Hist(bin("NJets", 20, 0, 20))

[jpivarski]

! I recently upgraded to numpy 1.5 too, and I get all sorts of mornings about binary incompatibilities. There's something going on with this release. There will be a performance at great when I replace some of the numpy calls with numexpr, but like everything that will have to wait until conferences are over.