Density mapped env fog incredibly slow to render

[SonyBoy]

Title says it all. I'm using a 3D texture to drive density on env fog that's creating some atmospheric smoke/haze in some spotlights. The renders are incredibly slow. Is this just intrinsic to this type of scenario? Is there anything I can do to speed it up without sacrificing quality? All the raymarching settings have been left at default.

[super gnu]

if you can get away with it, increase the step size until your render quality starts to suffer, if you can raise it, it gives massive speedups.

[SonyBoy]

Instant improvement. Thanks! I made the mistake of assuming a default setting was at a sensible value. Assuming scene units, I now realize that 1 is anything but.