Drag and Drop files with Winbox is very slow if connected to MAC

hi,
following config:
2 SXT config to PTP server+client
connect the client to lan of laptop
server is NOT connected to LAN, just connected wireless to client

issue:
open winbox to server with connection to his MAC !
open “files”
drag and drop a npk from windows explorer to winbox
=> max. speed is 125 kb/sec ! 10MB npk file takes a long time

solved it with:
open winbox to server with connection to his IP-address !
open “files”
drag and drop a npk frim windows explorer to winbox
=> max. speed is more than 800 kb/sec ! 10MB npk is loaded after a few seconds


does anybody know, why ?
=> no, its not the connection speed between the 2 SXT,
this speed is good at the time of connecting with winbox
i saw this issue on ALL sxt and qrt

br papaschlumpf