I've been working on a design using a "master model" technique (all the parts designed in one part file) for a relatively small assembly (only about 8 parts).  It does have a couple dense/high instance count fill patterns, but no in context references.  For some strange reason, every time I add a new feature SolidWorks insists on rebuilding everything, everytime.  Here's how my work flow is currently going...

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[Scene: A sunny spring afternoon in southwest Virginia. I'm working on a part file in SolidWorks with zero in-context references.]

Me:  Alright, SolidWorks, you've been working hard so I'm just going to add a simple cylindrical boss to a flat surface.  You can handle that, right? [Sketch, Circle, Fully Define, Blind Extrude]

SolidWorks:  No problem!  But let me rebuild everything when you're done. [SolidWorks Rebuilds after accepting Extrusion settings]

Me:  Uh, everything else was already fine, but sure.  Whatever you've got to do.

[A few moments pass while I reflect on the cylinder proportions and such.]

Me:  You know what, let's edit that feature.  I think I want to modify the end condition. [Right Click, Edit Feature]

SolidWorks: Sure...  Hold on just a few moments while I rebuild everything for you. [SolidWorks Rebuilds]

Me:  *Confused* What?  Why?  I haven't even changed anything yet.

SolidWorks: ...

Me:  Alright, whatever.  Hmm...  You know what, I think I'm going to approach this cylinder a different way. [Exit out of Feature Properties without making any changes. Zero changes.  Don't even rotate the model.]

SolidWorks:  Hold on just a second, I'm going to rebuild the model for you.

Me: Why the crap are you rebuilding again?  I didn't change anything.  Literally, nothing since your last two rebuilds.

SolidWorks:  I like rebuilding.  It's my thing.  Also, I'm an epic troll.

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Anyone know what the heck is going on?  FYI - I do not have rebuild verification turned on, and I'm running 2014 SP2.0.