i just fix your problem!
1. export your polygon objects to OBJ format.
2. export your spline object to AI format.
3. import your OBJ and AI file into an new sence.
4. you can save your max file less than 1 sec.
i guess your objects are imported from another sence or other instant modellings.
through changing their formats, i can clear up the bugs/noise datas in your objects/sence(I guess
).
hope this help, anyway.
and uploaded my max file, try to open and save it.