Simple parts with excessive memory usage

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Hello,
I have been using IV 2014 for the past two years, never had major issues. I led the 2015 update slip and just now on Monday got our IT to install the 2016 version.
Working on a simple rod with the new IV I suddenly got freezes and heavily reduced performance even though it was only one part that was opened.
I opened the task manager only to find my 16gb of memory being entirely filled by Inventor 2016. It seemed rather odd to me, so I saved the part and restarted my PC to check whether it would happen again. After the reboot and starting Inventor I opened the file and task manager. As soon as I was hovering with the mouse over the Inventor window the task manager showed a steadily increasing memory usage. Per edge I was crossing with the cursor the RAM increased by at least 10mb.
First thing I did was to check the settings but there's actually nothing that would let IV use such an excessive amount on such a really simple part.
I restored all settings to default, no change. Made a simple cube, same issue. Had a larger assembly loaded, same issue.
I'm really confused about this, first thing my IT department did was to check system requirements and decided to go for a new machine.
I think the problem is somewhere else.
I think it's ridiculous that for a part of maybe 180 kb there's information stored in the memory that has a volume of more than 13gb.
I don't have a problem with getting a new PC with better specs, but I just don't think it's normal that Inventor does this.
Does anyone have a clue what's going on?
I'm running WIN 7 Professional
on
Intel Core i3 CPU 550 @3.20Ghz
16 GB RAM
NVIDIA Quadro FX1800
28GB free on my HDD