Activity monitor alway shows the my memory pressure is "yellow" on my new iMac 27" with 8GB RAM. Swap use hovers around 1.5GB. Does this mean that I need to buy more RAM? Any way to know if 16GB will do the trick, or do I need 32GB? Screenshot of Activity monitor attached. I noticed that Safari grabs gobs of memory, sometimes 1GB for a single web page. That is pretty crazy!