Wow, thanks to randomly seeing "+jobs_numThreads 0" the game now actually runs! So poor cpu optimisation then? Absolutely disgusted with id.
Now just need to sort out the FOV, but at least I can play the damned thing!
Even worse quite a few sites are using +jobs_numThreads 4 as a tweak

I've increased the FOV by 20 with the following launch command-
Looks much better.
You should be able to use +g_fov 90 or +g_fov 100 now with the latest patch.