implied For Each loop ?

I several Items on the stage.

If I say, on event sheet, ...

Item -> some condition -> some action

...it works as expected for all the Items.

If I say...

System -> For Each Item -> (subevent) Item -> some condition -> some action

...it also works as expected for all the Items.

So in the first example, is it looping through an index of all Items on the stage? iow. an implied for each loop?

Is there any advantage ( performance, etc ) to explicitly using a For Each loop ?

See How Events Work in the manual. All object conditions (i.e. not system conditions) have implied for-each loops. The implied for-each is faster, so avoid using the 'For Each' system condition where not necessary, since it will degrade performance.

Thanks Ashley.