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20 years ago, I was blown away with the smoothness and stability of Linux while doing intensive tasks.
Today, on fairly recent hardware, my bluetooth mouse stutters while performing a backup (with nice +19 and ionice -c3).

Umm... what happened?

P.S. The bluetooth adapter and USB HDD are not on the same USB bus. I just checked ;)

$ lsusb |grep -ie blue -e seagate
Bus 002 Device 004: ID 0bc2:2344 Seagate RSS LLC Portable
Bus 001 Device 003: ID 8087:0033 Intel Corp. AX211 Bluetooth