lightmix issues

[daveclive]

Hey,

using c4d r20 and corona v4

when rendering to the VFB (interactive or final render) i can adjust the lightmix lights no problem.
However, once the render has finished and I try to adjust the lightmix settings, the entire system crawls to a halt and can barely process changing anything, or if do make changes have to wait for delayed changes.

how can the lightmix settings run faster when rendering then once finished. it makes it almost impossible to use.
This alos happens in the corona standalone image ediotr using a CXR after render has finished

Tried on 2 machines:-
16 core threadripper 1950x
i9-9000k

[burnin]

Do you have any postFX (TM, glare, flair...) enabled? Disable all that jazz.
If you've done an exercise, you got your test scene ready to share?