Another setting that surprised me with being turned on by default apparently on macOS 15 is System Settings - Spotlight - "Help Apple Improve Search":
"Help improve Search by allowing Apple to store your Safari, Siri, Spotlight, Lookup, and #images search queries. The information collected is stored in a way that does not identify you and is used to improve search results."
You just have to allow more than 75% memory to be allocated to the GPU by running sudo sysctl -w iogpu.wired_limit_mb=30720 (for a 30 GB limit in this case).