sorry, i meant cpu, not ram. my specs are OSX 10.11.6, 3 GHz Intel Core i7 , 16 GB 1600 MHz DDR3. i'm using an external audio interface Scarlett 2i2 as well.
with only a couple of modules in my rack going, the rack process is hogging 50% of my cpu. about the audio glitches - they seem happen whenever i use my os regularly outside of rack (switching between apps, scrolling and clicking).