ok so ive been tring to work on this drawing for the past 2 days. it only contains 1 part file n thats all. no assy's or anything. but between only this drawing and part it take my computer as much as 30 mins to do anthing with it. open, save, rebuild. every single time it does anything and needs to rebuild it takes atleast 30 mins. it is ONLY this file. everything else opens just fine. i do not understand. it does have alot of errors that ive been trying to fix but every time i do something to it it has to rebuild n take forever. any ideas what it going on??