How many Intervals can run at the same time before I get lag?

Hello,

I am making a game that uses a lot of separate movie clips with onEnterFrame actions happening at the same time. This can make it start to lag, since there are many of them.

I would like to use Intervals and EventListeners, since many of the MCs don’t need to be doing anything most of the time.

Does anyone know how many intervals can be running simultaneously before it starts to create lag?

Thanks