Dm-crypt freezing computer?

[Seabass]

I am extracting from a large tar file, and at around the 2nd gig, my computer starts to slow and even freeze up a bit. Mouse always moves fine, but that’s about it.

iotop reports dm-crypt is the only thing and is using 99% of my read/write.
htop shows minimal processing being used and ram isn’t full...

So... can dm-crypt as full disk encryption slow the computer to almost freezing?
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