Comment # 57 on bug 1017461 from Antoine Saroufim

I've also experienced this bug on Tumbleweed. I formatted my system a few days
ago and created GPT partitions to enable UEFI. After booting, I started seeing
random slowdowns. I noticed the issue starting too happen frequently after I
rolled back to an earlier snapshot. I'm not sure if this related or not but
btrfs-transacti has been eating one of my cores for over 2-3 hours on and off.