Big file problem

Hello i received big size file ( not so big in fact i had my larger many times )

File is done in Autocad propably 2014 .  And its very, very slow to open.

In Ms V8 is not so good but "ok", few minutes... but in Connect about 20 - 30 minutes.

I try save as dgn, make cleanup, compress but after - file is about 100 mb bigger than orginal dwg

Can someone check what is wrong with this geometry  ( file is for download here )  for a week  https://wetransfer.com/downloads/190bbb5ad8840203b6c2a5bdf086a89520170302070518/050a83cc78a10ab3875290eebdf58d4720170302070518/9dec05