About animated foliage and multiscatter

[wisemanxxx]

I have some questions about animated objects.
In my scene there are 8 different type trees(checked movable proxy) and I use multiscatter to place them(approx 500 trees).
And very low poly oppacity mapped grass with multiscatter.(Not movable proxy)
I want to make a short animation.But If I check update movable proxy and update animation geometry render takes toooo much time.Because I guess octane calculates all animated geometry before rendering new frame.
When I use octane viewport first time takes 3 min. to calculate and render takes 5-6 min.
but I go to next frame it tooks so much time.

When I render entire animation; this time increases to 25-30 minutes because of geometry calculation.

What must I do for speed up this process.Please give an advice.