question about multiscatter / proxies

[HHbomb]

I use last octane release and I want to render a walkthrough.
I have a some multiscatter object, but I didn't see in precedent release "processing geometry" soooo looong between frames.
It is like that or it has changed and I need to go back to old releases ?
(arghhh it is urgent....)

[HHbomb]

For people who can have problems like me with multiscatter and proxies :

- multiscatter : I made a big mistake. I don't like to tell MS how many objects I need for grass, so I increase number of objects and use collision to control density; big mistake because if max number is too hight MS need to calculate collisions a "long time" (between each frame).
render time can be prohibited.

- When using proxies, you need to switch them to "original" when rendering animation, if not, you have a "process geometry" between each frame.

Can somebody can tell me how to select all proxies with maxscript or another method ?
( i use Modifier zorb 2 and it works fine )