[srevenant]

I'm confident it isn't purposeful. But no hardware errors can be found.

Virgin install Tahoe: grinds from 74-C up to 100-C within a minute and then throttles. Virgin install Sonoma: runs fine. No temperature change of note.

This isn't indicative of a hardware problem.

[vsgherzi]

Nothing in dmesg? Maybe try to put some dtrace probes into the sys calls and see if anything is suspicious. Let spotlight index for a day or so first.