Well then.. had a lovely morning with a machine that seemed to perform at about 30% of the speed it usually did, especially on terminal/umbraco/console apps.
Turns out upgrading from Powershel 7.2.4 to 7.2.5 plus a reboot fixed that. Starting a terminal window now takes less than a second instead of 10-20 seconds 😬
So let that be an FYI for y'all 👆