On Tuesday, January 22, 2019 at 1:58:02 AM UTC+13, Nick Janetakis wrote:
>... an I/O heavy action ... Vim is frozen ...

This sounds much like a Linux I/O scheduler problem, especially as

>If I move my source code to the SSD, I don't notice this hanging / buffering 
>effect

These can be inexplicably hardware dependent; identical OS and software on 
another machine can be problem free.  Totally frustrating because it seems not 
much attention was paid to it by the Linux devs for years.

For example, see https://bugs.launchpad.net/ubuntu/+source/linux/+bug/381300

Typically, deadline is used for SSDs and cfq for hard discs.

What does 

    cat /sys/block/sdb/queue/scheduler

say?  If it says something like 

    noop deadline [cfq]

You might try

    echo deadline | sudo tee -a  /sys/block/sdb/queue/scheduler

Regards, John Little

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