"deleted" process and enormous "system data"
My MacBook Air (Intel chip, Sequoia 15.1.1) is running slow, frequently overheating, and is running critically low on free disk space. The "deleted" process often takes up 50% or more of CPU. System Data is currently 341 GB. There are all sorts of minor issues in running the computer, but I presume they're symptoms of these storage and CPU issues.
I've restarted the SMC and restarted in Safe Mode. I've run Etrecheck and CleanMyMac, and they've just told me the things I already know. The iOS is up to date, and I've virus scanned (excruciatingly slowly) with BitDefender.
I use iCloud and DropBox so most of my files are stored on the Cloud (and actually many of those I use regularly have been, irritatingly, uploaded). I'm not an advanced or sophisticated computer; I edit Word documents, read pdfs, use Apple Music, browse the internet, stream—no complicated apps or massive files. I just don't know what to do—I could move a load of files to my work desktop and just use this €2.000 laptop as a typewriter, but that feels ridiculous.
MacBook Air 13″, macOS 15.1
