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Copying large files to USB Device blocks system

When copying large amounts of data, e.g. digital images to an usb drive, I noticed laggy system behaviour, to the point that the mouse would not move.

The problem seems to be cache queue blot, which I could reduce by adding these settings to my local sysctl config file (/etc/sysctl.d/my-sysctl.conf>:

vm.swappiness=10
vm.dirty_background_ratio = 5
vm.dirty_ratio = 10

Ref: https://lonesysadmin.net/2013/12/22/better-linux-disk-caching-performance-vm-dirty_ratio/

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