I was also having a problem with my 64GB system ram filling up within 30 seconds of opening a project in PP CC. I had to make a new project and meticulously import clips one by one until I found the culprit, and it was actually two phone pictures taken in portrait mode on my Pixel 2 XL. Tested a few times and I'm 100% sure it's something with these two files - if I import either one (just jpg around 5MB each) the memory immediately starts filling up and the program becomes really laggy and unresponsive. Normal phone pictures are fine, it's just the portrait mode shots (with faked bokeh - so maybe because of the depth data embedded in the file). Fixing it was pretty easy, just open the project, quickly find those two files and clear them from the project bin, then SAVE, then close/kill premiere, then re-open.
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