How much overhead associated with messages?

Hi guys,
So I was trying to figure out why my application seems to keep adding memory every time I turned my NSTimer call on to execute code every second. I couldn't find any memory leaks but there was a stack that appeared to keep growing because of objc_msgSend calls. Is there a lot of overhead associated with calling a method every second that I'm missing? I can't imagine the caching of pointers would take up that much memory for something so basic.
Also, I currently make a call to a parent view. I didn't know if there was a way to fire a 'global' event that all objects could just listen for.
This documentation helped, but didn't provide any real solution as to why I was losing memory or how to possibly turn off caching.

Hi,
Remove the Apple ID from any iPhone you don't want it linked to.
On the Mac go to the Messages app and Sign Out of the Apple ID in iMessages account.
Quit the App.
Now open a Finder window
In the Go Menu use the ALT key at the same time and select the Library that appears.
In here navigate to the Preferences folder.
Delete the com.apple.ids.service.com.apple.madrid.plist file (Drag to Trash).
This will delete all Aliases and Alternatives in the iMessages account.
Re-open Messages and Add the Apple ID you want to use.
Now Add the Apple ID to any iPhone you do want to use it with.
Restart Messages on the Mac and when the pop ups appear to say what the iPhone is using Accept the option.
If any iPhone number appears  in a pop up that you do not want to use then Deny the pop up.
(it will still add the Apple ID or phone number to the Alternative/Aliases list and the Start Conversation From drop down but they will not be active).
Basically once any two iPhone number become linked via iMessages it is very difficult to remove this link.
An Additional iPhone number on your iPhone as an alternative cannot be removed.
Only deleting the .plist will remove it (at that point in time) on the Mac.
Whilst denying fresh pop ups helps the items still seem to be listed.
I have two iPhones using two different Apple IDs and obviously two numbers  along with an iPad and the Mac running Messages.
Periodically each devices gets a pop up saying Messages is trying to display all the options on all devices again
As William said the simplest method is to Untick the item in the list of Alternatives.
8:38 pm      Wednesday; January 15, 2014
  iMac 2.5Ghz 5i 2011 (Mavericks 10.9)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
 Mac OS X (10.6.8),
 Couple of iPhones and an iPad

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    Restart Messages on the Mac and when the pop ups appear to say what the iPhone is using Accept the option.
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