I noticed that the behaviour of a copy or move window appears to calculate and perform differently from past OS X releases. There appears to be no issue but some users may believe there is an issue if they are not patient.
Here is my setup.
Newtork ISP Router - ethernet > Express - WIFI N -> Extreme (in bridge mode w/express)
Here is what I did.
1) Moved a 6GB file from the 10.11 desktop to a drive attached to the Extreme via a USB hub
2) As the move began, only 1KB was tranferring per increment, it then began to increase and increase but disappointingly, the expected completion time was reportedly 15 hours.
3) Patience persisted and 2GB into the move, there are 20 minutes remaining.
I don't recall the calculated time, in this case 15 hours, displaying for as long as it did in past versions of OSX.
In case you have a network performance issue or believe you do, please perform proper troubleshooting before suspecting the Finder or 10.11. Also consider wireless network interference where applicable.
Best regards
Alex