Thank you very much for your valuable feedbacks Jon! :) I mostdef check the MB and the personnalised Render settings then, and your link ! Time to sleep here . C ya!

Yes indeed, a bit jerky. I thought MB might be faster in post (after effects) ?

Never tested it within vue. Sure it must remove lotof flicking in vast trees scenes. I should try it, thanks for advice. Is it fast? I mean, afaic, it preety much sucks in c4d AR3, (VMB isn't always enough, SMB sucks : x20 times); it's very fast with Vray (for example, for a 20mn frame, MB takes 30 secondes). Wonder how Vue handles it?

I'm actually testing a frame with more antialisaing in textures and damn! Renedertimes triple! Mmm, or is it because of the 50 trees I added?

haha I feel so noob in vue ^^

Thanks you Jonj1611.

Yes it's perfectly stable now. Arround 17mn per frame in HD 1280x720@25fps, on a 16T macpro.

But I think I was in "preview mode" within Vue, wich explain the GR splotches.

Since I went in "Final", looks stable. How stoopid am I? ^^

I'll most certainly have to do more testing before finding all the good settups, but for now it is OK. :)

C-Ya :)

I allready reply to myself, but any comment would still be much appreciated.

So.
I re-lowered the quality boost sliders to default zero, and checked the re-use light box, and the second frame started rendering after 18'15".

From what I can see, the GR solution seems to be stable ! =D

Have to leave soon from my place, I'll leave the render go and see after work how it went tonight.