AutoCAD 2014 crashing

I am using autoCAD 2014 and have a farily large drawing so it was becoming slow. I copied and pasted the part I was working on into it's own drawing but this made AutoCAD so much worse. Everytime I try and use the fillet tool, the rectangle tool and many other it stops working and I wait and wait and eventually have to use the task manager to end the task and shut down AutoCAD whih then causes me to loose all the work I have just done. I have ahd to start saving  my work after almost every command, which is so annoying and time consuming. I am operating on a computer with windows 8 64-bit. 

I have tried the AUDIT command to try and fix it but it shows 0 errors to fix everytime.

Any suggestions?

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