In your nice recent change to chat frame selection, you've manged to default it to chatframe3 instead of to off, which is what creates so much garbage, unlike my earlier assumption of 'any addon' I always used the chatframe for printing. So it would be nice if you had it off by default, or a different option altogether.
The bigger the message is the more processing you must do, so it swings more that way in my opinion. But in a realistic situation, its both. 3 messages with massive data won't really do anything, and 100 messages with small data won't do anything, the processing for both is more or less equal. 100 messages with big data, won't help much. :)
If you see it, it affects you, as you need to download and process the messages to see it. Turning off the addon will hardly help anything(on your end), especially cartographer since it hardly sends anything.
hY is Inventory lib, again I have not checked its hash.