btrfs system slow down with 100GB file

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I'm getting significant iowait while writing to a 100GB file. I have already made it nocow by copying it to another directory, marking the director nocow (+C) and using cat <oldfile> <newfile> to re-create it from scratch.

I was under the impression that this should fix the problem.

On a tangent, it took about 30 minutes to delete the old file... My system is a Ryzen 5 3600 w/ 16GB or memory but it is a spinning disk. I use an NVME for the system and the spinning disk for /home.

Currently I'm getting random GUI freezes due to the iowait problem and my HDD indicator light basically stays on solid for over an hour now.

Any tips?

Thanks,
Richard
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