Hey as I do at least a few times a week when I'm off is to look at Plugins I've not opened in a while. I opened bx_oberhausen today because it was one of the "Unified" libraries, for some reason it spikes 3 times after each patch is opened, then after that it seems to be fine. Not sure if you have this vst or not but, figured I'd report it. This was on my Mac Intel standalone, doesn't do it on the PC Version thankfully.
Thanks for the report. Some plug-ins do draw a lot of CPU briefly, just after instantiation, as they set themselves up internally. Because bx_oberhausen only seems to do this on the Mac, it may be a Mac-specific issue. I do have bx_oberhausen, but haven't tried it on Mac in a long time. I'll look into it.