It's not normally paging, but thermal throttling which involves the machine appearing to 'spin' but it's actually just the kernel keeping the cycles to itself, which typically give you beachballs as a side-effect.
And one tip is to use the right hand side USBC ports for charging, not the left hand ones as for some reason or other they tend to cause the machine to heat up more...
the right hand ones are the only ones that can drive external monitors (on mine anyway). I feel like I'm the only one that has this - I had a MBP 2019 - first batch - and I thought I'd read that one side was different than the other re: power. Power works on both sides, but monitors won't run from the left usb-c ports. but it's not documented anywhere. :/
And one tip is to use the right hand side USBC ports for charging, not the left hand ones as for some reason or other they tend to cause the machine to heat up more...