I deleted the cache & render folders. Inside the cache folder was a 'catalog' folder with more cache & render folders inside. Is that normal?
I've not yet noticed a performance loss.
I often look at, sort and change metadata on groups of images of around 7,000 px on the long side. The render cache is 16,000 MB. Is that reasonable?
Debug logging is off but I only remembered to turn it off a week or so ago. Maybe you're seeing an old log?
David