Why are diffuse integrals calculated for every run?

[LauraH]

Why is the diffuse shading information computed for every run, unlike the direct shading?  Can't this information at least be held in the active memory as long as you're working on the same variant?  I'm tweaking my loss terms and every time I rerun, PVsyst takes the time to build the diffuse integrals again.  I can understand if you don't want to save it in the export, but while you're working would be nice.  Thanks.