O ya thats abit high mate. If I where you I'd first try to convert back into quads and delete a lot of the extra edges might take some time.

Or restart and make sure your cv curves are lower when it comes to the number of points on the curve itself, you can sent or change the setting under rebuild curve optionbox.

That should help with the high number of polys when you convert from nurbs. Polys are not always the best for type and numbers.