Hi, thanks for checking, so it's possible to be an OSX issue, or it could just be my setup of course!
And yes, CPU efficiency is exactly why i was loading it up so many times as i've only just started with Studio One, i only had 3 Analog Lab(2) plugins running and it started displaying these symptoms, normally i would only have 1-2.
And yup Studio One not the most efficient hence why i was seeing how many plugins i could load up, i moved from Logic which is one of the best for efficiency.
However, the Transform to Audio function is so so great in Studio One, it knocks all other freeze modes i've tried on other DAW's out of the park - it renders audio (with tail), then unloads the plugin, yet stores it's setup within the same track so you can revert back at anytime you want - simply incredible, and it means you can open projects on machines that don't have your plugins installed on them, great for future proofing projects.