Copy file with Dolphin is slower

[Armelius Cameron]

Hi,
I am always curious why copying file in Dolphin is always so much slower than 
just using command line. For example, for convenient I have an entry in my 
Dolphin to access my remote server via fish://username@servername. 

If I try to copy file from my local machine to the remove server, it shows 
transfer speed initially at 1.3Mib/s, and sometimes it drops to only hundreds 
of kb/s. When I try using scp, I get over 11MB/s, which makes sense since I'm 
on the Gbit LAN.

Annectodally I've seen similar thing when copying large file over different disk 
partition or to external drive via dolphin or just command line 'cp'; cp is 
always faster. But I like to convenient of Dolphin so for smaller file size 
this is tolerable. But I'm curious still of the big performance difference.

Thanks.
AC