Does Sage use some sort of cache or swap space in your home directory
when working at the Sage command line?

I keep my home directory on a small USB portable notebook hard drive
and when doing timing experiments with large matrices (25 million
rational entries on a machine with 8 GB) I get noticeably slower
results and see more disk activity through the one light on the
drive.  If I run Sage as root, so the home directory is on the system
disk, performance is more in line with expectations and there's no
apparent disk activity on my external drive.

If this is the case, is there a configuration or environment variable
to control the location of the disk activity?  I haven't been able to
find anything of the sort.

Thanks in advance,
Rob
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