AutoCAD 2013 :: How To Clear UNDO Or Layout Memory Without Closing And Reloading The File

Say I have a model and some layouts in a file.

I open the file to the model. My RAM usage is about 33%. Next, I open the first layout and my usage climbs to 43%. I open the second layout and my usage climbs to 52%. I open the third layout and my usage climbs to 62%.

I can go back and view the layouts already opened marginally faster then when first opening them, and my RAM usage will not increase.

If I continue to open new layouts, my computer will spend all its RAM holding these and freeze. My computer will suspend graphical processing and be forced to run on sips of RAM until all active commands are finished. But RAM usage will never decrease.

I have been working with my Windows Task Manager open in the corner, watching this happen. This way, I can save and close the file to clear the RAM and then proceed to reload the file and continue working on my file with 34 layouts.

I do not know if it is a function of storing the UNDO functions, or just how the program is designed, but this is a problem for me.

QUESTION

Is there a way to clear the UNDO or layout memory without closing and reloading the file? I do not have to close AutoCAD - just the file.

ATTACHEMENT

The attachement is a screenshot of my Task Manager.

I started with TM, browser, and AutoCAD open (I had already started writing this post)

I opened the file to the model.

Opened up 6 layouts (you can see the bumps)

Saved (you can see the tiny rise)

Closed the file, but not AutoCAD (precipitous drop ;] )

Lastly, I reloaded the file.

Windows 7 64bit w/ 64bit AutoCAD 2013