Have you tried copying the file using explorer from the capture machine to the edit machine and placing it on a local drive for the edit machine ?
This would help you establish if the problem is with Premiere or with your network.
Most people here will tell you not to edit a file opened over the network, but to copy the file to the local drive before opening in Premiere.
Although your gigabyte switch might imply speed, its no where as fast as the access from a fast HDD into the processor in the same machine. There is massive amout of network overhead that isn't involved in a DMA transfer from a HDD.
You may be experiencing firewall issues. Does premiere have read-write access on the other PC?. Premiere creates hundred of IO threads when you're editting.
I'm semi-impatient. haha. Copying a 90-100GB file takes a good 30 minutes. I've resorted to that method the past couple weeks, but I have edited over a network in the past with out issue. I just can't remember what I did. It may not be a Premiere issue, it could be a network driver issue. I have reinstalled those, so Premiere was just my next guess.
I'm not entirely sure if Premiere SPECIFICALLY has read/write access. I've set the drives on the capture box to allow full controll for all users (I work for a church, not really concerned with people getting into my files) Is that what you were referring to?
Wow, if copying a 100GB file from the network to your PC takes on the order of 30 minutes, then this is NOT a fast network and you will absolutely have to work with files on your PC locally for CS5 video editing. File copies across my gigabit (copper CAT6) ethernet connected network does 100GB in about 8 minutes for comparisons sake.