incapacitated dolphin when copying 6.5TB of data into a Vault stored on large USB disk

Question

It takes me on average between 30 to 60 seconds just to get 1 regular click done in Dolphin. It ain't funny :p Darn annoying to be honest.

I'm running kernel kubuntu 6.11.0-26-generic

    # lsb_release -a 
    No LSB modules are available.
    Distributor ID: Ubuntu
    Description:    Ubuntu 24.04.2 LTS
    Release:        24.04
    Codename:       noble

The files are going from /dev/sda2 to /dev/sdb1

# sudo parted -l
Model: ATA ST18000NM000J-2T (scsi)
Disk /dev/sda: 18,0TB
Sector size (logical/physical): 512B/4096B
Partition Table: gpt
Disk Flags:
Number  Start   End     Size    File system  Name                  Flags
 1      1049kB  538MB   537MB   fat32        EFI System Partition  boot, esp
 2      538MB   18,0TB  18,0TB  ext4
Model: WD My Book 25EE (scsi)
Disk /dev/sdb: 8002GB
Sector size (logical/physical): 512B/4096B
Partition Table: gpt
Disk Flags:
Number  Start   End     Size    File system  Name                Flags
 1      1049kB  8002GB  8002GB  ext4         NicerDotApp-data8d
Model: MSI M480 2TB (nvme)
Disk /dev/nvme0n1: 2000GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:
Number  Start   End     Size    File system  Name          Flags
 1      2097kB  317MB   315MB   fat32                      boot, esp
 2      317MB   2000GB  2000GB  ext4         kubuntu_2404

Let me know if I need to provide more details.