Day 252/19. It's a filthy fan.

A good clean out and an upgrade in the big PC this evening. Dust removed (the picture is the 'before'), filters cleaned and diagnostics run. 2TB SSHD C: Drive swapped out for a 2TB SSD. BIOS updated, drivers all checked. Rebooted and much improved performance.
I still think of myself as an engineer above all else.