Yes. Unfortunately it is a very badly optimised PC Port. Try lowering some details (especially AA) and download the latest patch, to squeeze some more fps.
Install the latest patch v1.0.7.0 and try running some commandlines by reading the readme provided.Rockstar has listed all commandlines in the readme.Hope this helps.
dont count on it. most setups will run the game on between 30 and 60 fps everything from a gtx 260 up to a gtx 690 all give roughly the same fps numbers.