Since the last one didn’t work.
I got mine (long gone) in 1973 for $250, with a 50mm Summicron collapsible lens. It was quite old then (I seem to recall that I once looked up my serial number and determined my M3 was made in 1954; same vintage as me).
But inflation since then has been a lot; a random online calculator says my $250 is now worth $1391 (and looking deeper into the ebay search, that bottom guy is an optimist).
It’s really bad at using system resources effectively. I’m sure this is why it’s so slow at exporting developed photos, and it’s probably also why it’s slow to respond to controls. Here we see Lightroom using barely half the CPU exporting 18 photos—something that is trivially parallelizable to 18 cores (since the photos are independent). In contrast, the old Bibble Pro, which is now available as Corel Aftershot Pro, would always put the whole processor to work.
Recently added monitoring of CPU and disk temperatures to the servers I use. Good timing!
I also replaced a medium-sized fan (maybe 80mm?) with a larger one as the main chassis fan. Since the CPU cooler fan is ducted to the side of the case that probably didn’t affect the CPU temps, but it definitely reduced the hard drive temps.