refraction u values

[blinkimage]

is it safe (stable) to use refraction values of 0.0 or 1.0 (when colour is white) so that there is no refraction calculation?

(basically, I need window glass to render quickly but am not bothered with accurate refractions)

[egz]

Yes, just set the IOR to 1.0

[nlo]

will the material render faster if ior of 1.0 is used?