php5-fpm - Dynamic vs OnDemand

It would be optimal for people with a good amount of ram to use dynamic as it lowers the request delay. However as we know that setting chews up a LOT of ram.

Is there a method by which we may set to dynamic without it being a ram monster?

There is very small, unnoticeable difference in ondemand v/s dynamic. I have changed (this site) to run in ondemand and did not feel any difference.

Only thing, server RAM usage and CPU usage is lowered as processes are created ondemand now. We will test this for few more days.

Ok great… I will do some blitzing tomorrow and report back