I’ve actually noticed it happening more recently because I’m working on responsive web layouts. This often involves taking a file with a lot of layers, extending it vertically sometimes thousands of pixels, and then moving all the layers at once.
This seems to be a particularly RAM intensive operation, and used to bring my workstation to a crawl.
It was enough of an issue for me to get an upgrade to 32GB, and that’s fixed it for my situation.
YMMV.
