Finder becomes unresponsive when viewing network folders with large amounts of files (OSX 10.6.8) When loading a folder which contains around 500 video files (each approximately 200mb-700mb in size), Finder becomes unresponsive and displays the beach-ball. 

The folder in question is a networked folder (on an AvidISIS server). Network speed shouldn't be an issue as we are accessing the server using dual ethernet cards (high-end).

What's annoying is that this only occurs on systems running Snow Leopard. Our Lion systems (which dont even have the dual ethernet set-up) have no problem accessing the folder. I've also tested this on SL computers without the dual ethernet and the issue still exists.

Furthermore, if I open the folder, wait 10 seconds and then scroll around with the mouse, the folder responds fine for a while. But if I click and drag the scroll bar Finder shows the beach-ball again. 


Is there a way to prevent Finder from slowing down when accessing the
folder?
Could it be due to Finder trying to load thumbnails of
the video files?


(both the Snow Leopard and Lion systems are fully up-to-date - mix of Mac Pros and Mac Minis)
Quicklook may want to read the remote files to generate an icon preview, and that on a slow network can be problematic.

A trick that helps me in similar situations is to uncheck "Show icon preview" from menu View -> Show View Options (Command-j)