I am also experiencing the same thing. Freshly installed dragonfish 24 release; no apps running, basically everything on default other than encrypted pool and forced client / server smb encryption. I am not sure it’s the same, but for my case, I have very LOW cpu usage(reserved 32cores), 1TB RAM, 12 x 18tb exos in Z2. i am migrating NTFS 80TB of data to ZFS. After a whole day of transfering data, i will suddenly start to notice significant transfer speed slowdown; specifically heavy I/O operations like small 4k files, will sort and travarsal extremely slow, like 3 file per second; WEB UI completely locks up and cannot login until all file transfers are stopped; and in CLI typing has huge delay, letters appear half second or copule seconds later alltogeher. Strangely “asyncio_loop” also starts to consume about 1.6GB of SWAP when i have 1TB of memory, 65GB Free, 900GB ARC, and only 15GB in service. stopping file transfer “asyncio_loop” swap also goes down, and web UI responsive again, transfer throttle improves but issue presist and comes back once file transfer resumes. Only workaround is to reboot truenas and issue goes away for another 20+ hours.