Pretty cool. I get 22 FPS in fullscreen Full HD, no matter if KWin compositing is on or off. This is Firefox 20.0, NVIDIA drivers, GTX 660.
Though to start it, I had to reload the page, as the first time around the image got stuck somehow. Weird.
Something is definitely off with your setup. I get 16fps and I have a Quadro 140m about 400mHz clockspeed with 16 cuda cores. You should beat me by a 1.6km(1 mile). Try Firefox Nightly,
# sudo add-apt-repository ppa:ubuntu-mozilla-daily/ppa
# sudo apt-get install firefox-trunk
And/Or use the 313 nvidia drivers instead of the 319 (319 apparently slows performance down) and install vdpau-va-driver
I used Nvidia 313 driver, nvidia quadro 140m, vdpau, xorg-edgers repository, Gnome Ubuntu Remix Saucy Salamander 32-bit, Gnome-testing repository (gnome-shell was 3.9.1), and firefox nightly 23a.
I got 16fps, but Epic Citadel definitely looked/rendered better than anything I have thrown at my computer through wine. Have I missed a generation of graphics or something; I've never seen an engine look so good on my computer. O_O