why is my bulid libmxnet.dll Cpu occupancy rate very high？

[snowdas]

Hi yajiedesign：
I use your MXNET cpu version， run MTCNN model detect face and Cpu occupancy rate is 40%，but I downloaded the source code and compiled the libmxnet.dll file myself. The CPU usage is 80%. I compiled it using opencv3.4.2 ，openblas and dmlc. I do not know why this is so，please tell me which libraries have you used? or have you modified anything? thanks