Hatch Analysing Boundaries

hi

For some reason my working file suddenly got corrupted. it become 32GB file. i tried to PURGECLEAN and it became 58GB. after spending  few hours, i mahage to copy plans into new file but still over 2GB which should be no more than 800MB. its 2D sketch with some hatch only.

 

now when i create hatch, i get message saying " Analyzing Boundaries" and it goes processing round and round for very long period. 

 

any idea please ?

 

thanks in advaance.