Performance regression for MXNet 1.5.0

[QueensGambit]

Hello,
I noticed performance regressions for residual, convolutional models when updating from MXNet 1.4.1 to MXNet 1.5.0.

• https://github.com/apache/incubator-mxnet/issues/15640

Did anyone make the same experience?

Best,
~QueensGambit