This is certainly not normal under your configuration, I use it on a computer 10 times slower...

Is it the first time, you use it? Are you sharing many big files (over 300MB) with it? In lower left, there is a number in a green circle, it does indicate how many files you are sharing, does that number increase with time (indicating you are hashing your files)?

You could always try reinstalling FW and deleting the FrostWire prefs in C:\Documents and Settings\*your user*\Application Data\

Application Data is hidden you you have to go in Explorer Options to show it.

Ciao

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