Efficiency vs. simplicity

In passing along event objects down a ui hierarchy, I can either modify
the
event and pass it along, or create a new event at each level. The first
case
is efficient, but introduces side effects. In the second case, there is
a lot
of object creation going on. I was wondering if Ruby uses object
recycling
internally? If not I guess I could roll my own, or is it really worth
it?

Thanks,
Mike