Yariv3G,
I recall your asking a similar question before. Here's my take: I'm not familiar with PER, but if you're looking for a fairly good measure of "X bytes sent/received in Y seconds" (similar to what you get from the command-line FTP client) and if you've got the Internet Toolkit, then you should be able to get a good result with Tick Count and the String Length or File/Directory Info functions.
I don't recall what LabVIEW version you're using, so I've attached a picture of an extremely simple example that demonstrates how to measure the FTP download speed of one file. When I run it on a 4.5 MB file, I get a throughput value nearly identical to the one I get for the same transfer on the command-line.
Regards,
John