took too long to run

Hi all, Proxmox 8.2.4 up and running incl. all updates. Qnap Nas as source PCIe M2 4TB SSD as destination. IO delay ~ 0,1 to 0,2 0% Shutdown VM Move harddisk from QNAP NAS to PCIe M2 4TB SSD. FileSize = 64 GB copy started ~ 1GB / sec IO delay up to ~ 10% Now stil not ready after 1 HOUR ...