More updates this issue seems to specific to linux, reproduced Original posters 
issue on a linux box
mxnet 1.1
```python
>>> import multiprocessing
>>> import time
>>> 
>>> def mxnet_worker():
...     b_time = time.time()
...     import mxnet 
...     print 'time consumes: {}'.format(time.time()-b_time)
... 
>>> read_process = [multiprocessing.Process(target=mxnet_worker) for i in 
>>> range(8)]
>>> for p in read_process:
...     p.daemon = True
...     p.start()
... 
>>> time consumes: 0.513573884964
time consumes: 0.518635988235
time consumes: 0.553323984146
time consumes: 0.549813985825
time consumes: 0.558361053467
time consumes: 0.556171894073
time consumes: 0.566649913788
time consumes: 0.569785118103
```

mxnet 1.3
```python
python
Python 2.7.12 (default, Dec  4 2017, 14:50:18) 
[GCC 5.4.0 20160609] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import multiprocessing
>>> import time
>>> 
>>> def mxnet_worker():
...     b_time = time.time()
...     import mxnet 
...     print 'time consumes: {}'.format(time.time()-b_time)
... 
>>> read_process = [multiprocessing.Process(target=mxnet_worker) for i in 
>>> range(8)]
>>> for p in read_process:
...     p.daemon = True
...     p.start()
... 
>>> time consumes: 8.75463604927
time consumes: 17.4193239212
time consumes: 17.656072855
time consumes: 18.1875190735
time consumes: 18.4937279224
time consumes: 18.5608999729
time consumes: 18.5980598927
time consumes: 18.6172778606
```

[ Full content available at: 
https://github.com/apache/incubator-mxnet/issues/12255 ]
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