SUMMARY
When copying files to NAS using CIFS over WiFi, Dolphin copies take >2 times longer than the same file copied using cp

STEPS TO REPRODUCE
1. create 1GB file: head -c 1G < /dev/urandom > /tmp/1G
2. mount NAS cifs: mount -t cifs -o rw,username=UID,password=PWD,domain=WGP,vers=1.0 //SERVER/SHARE/DIRECTORY /media/DIRECTORY
3. drag and drop /tmp/1G to /media/DIRECTORY. Measure time.
4. execute: cp /tmp/1G /media/DIRECTORY. Measure time

OBSERVED RESULT
Dolphin gets 7MiB/s, cp gets 18MiB/s

EXPECTED RESULT
Dolphin = cp

SOFTWARE/OS VERSIONS
Windows: Not tested
macOS: N/A
Linux/KDE Plasma: 
 Operating System: Manjaro Linux 
 KDE Plasma Version: 5.17.5
 KDE Frameworks Version: 5.66.0
 Qt Version: 5.14.1
 Kernel Version: 5.4.17-1-MANJARO
 OS Type: 64-bit
 Processors: 8 × Intel® Core™ i7-7700HQ CPU @ 2.80GHz
 Memory: 15.6 GiB of RAM

ADDITIONAL INFORMATION
Not expecting Dolphin to be 100% of cp but less than half the speed???  :O
Classified as minor because it works, just  S L O W L Y . . .