Did some quick testing with the latest version and it's much better now. No AA or AF and lowest fps I got was 28 and the smoke itself looked much, much better. Nice job!
And did this running with stock clocks of my GPU. All the other test were when I had overclocked it to core@682Mhz, Mem@992Mhz and once again, with Ati X1950XT 256Mb