Is your system then actually low on memory then? This doesn’t seem to work for me, but then again even javascript sites aren’t going to eat 32gigs just like that.
One theory that I tested, was that whether it was a scheduled BTRFS scrub in the background (basically reading all the data and checking for errors), but it doesn’t seem to have an effect when manually started.
Another observation now that it’s running fine: At the time my fans never revved up to speed like they do now. Just stayed mostly silent. It really felt like it was accidentally using an integrated GPU, which I don’t have…