AddEventListener - creating an async method?

Hello. Beginner question.
I have an edit-able DataGrid which is populated by an
ArrayCollection. There is an Event Listener on the ArrayCollection.
When a user edits a field in the DataGrid, the Event Listener
calculates the sum of all of the items in a row - and displays it
in a Label field beside the row.
The issue is performance. Performance isn't great when i go
from one DataGrid cell to the next, so I'm trying to speed things
up a bit. So one thought is to modify the code so that the
transition to the next cell isn't dependent on the calculation
completing...
So how do I do this? (or doesn't this idea make sense?)
Secondly, anything else i should be looking at to improve
performance?
any assistance is greatly appreciated. thanks for your time.
chris

quick update. i found the main source of the performance
issue. the event listener was doing more than just calculating the
sum. it was essentially repopulating the grid every time an edit
was made. so i removed that event listener at the appropriate time
and things are considerably better.
so there's just the other question - although the more i
think about it, i'm not sure it's a legit question. when something
fires an event listener, it doesn't wait for the listener to
return, right? so it's already async. hmm, so yeah, i guess both
questions were bogus.
my apologies.
chris

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Gary:
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