My memory as of the moment has 60.67 GB free out of 499.25 GB. It's smoother now compared to before. Because I deleted around 40 GB worth of memory. Basically, the "system overload" rarely appears now. But I still notice that my Mac is quite slow in responding especially while clicking on plugins while playing my session. Before clearing that 40 GB worth of memory yesterday I got the "system overload" more frequently.
I'm not entirely sure about the CPU usage, but when I play my session, the CPU meter gets to about half of the bar up to 3/4ths of the bar on average.
Here is what's going on my mixer to give you guys an idea
https://z-n.ak.fbcdn.net/sphotos-h...._=1416004767_f0412a23c7f1368314dd3b6def13d743
And here's the specs of my Mac
Processor 2.5 GHz Intel Core i5
Memory 4 GB 1333 MHz DDR3