Noise in direct diffuse pass

[marchermitte]

Hello
There is one think I tend to do in general with renderes, to diagnose where I need more samples, It's to render specular / reflections, Direct and indirect diffuse passes, and check where there is noise. This way I can increase samples in the right departement.
I have a noise problem with an octane animation, but It's really apparent in the direct diffuse pass.
Increasing lights and emitter samples doesn't seems to do much.
Any Advice?

Thank you!

[marchermitte]

Thank you.
Nice website that you put together, lots of clear infos.