Difficult to say. I don&#x27;t completely understand the activity monitor RAM column: <a href="http:&#x2F;&#x2F;i.imgur.com&#x2F;QS3NPQQ.png" rel="nofollow">http:&#x2F;&#x2F;i.imgur.com&#x2F;QS3NPQQ.png</a> 
Looking at the activity monitor details we see that it uses something in the order of 2.54 GB of real memory. I suspect the rest is mostly compression.