Do you have the 32-bit graphics libs for your Nvidia card installed? You also might want to look at using Wine 1.7.39-staging (NOT the system Wine. The one you install from Tools -> Manage Wine Versions), and enable CSMT via Wine Configuration in the Wine Tab in the Configuration Window. Check the wiki if this is a bit confusing.
Also, it is recommended to update POL to the newest version from our Downloads section. It will not fix this issue, but there are a lot of fixes since that particular release that you have.
I looked at the appdb entry; are you using the version of Wine it says works? It says Wine 1.7.30 is the working one, but you say you have a different version of Wine, which I assume you are talking about the System Wine. The System Wine is completely separate from POL's WineBuilds.
Now, that slow of a speed is REALLY slow. You should totally be getting more than that. Just make sure that you also have the 32-bit Nvidia GL libs installed as well, and if that doesn't fix, for sure try the -staging POL WineBuild that I mentioned above, as that has been shown to give MASSIVE gains in performance for certain games and certain setups (though I am fairly certain that you are not using the correct Wine version listed at appdb, or you have a driver issue.). It is worth a shot.
Edited by RoninDusette