UPDATE: On Reddit, Treyarch has posted another update regarding their progress on fixing the issue. Here’s the update:
We reduced the capacity at the data center down to a level that we knew it could handle, based on what we had seen over the last two days. We are going to start increasing it from there so we can determine where the bottleneck is. So for now there will be more games being hosted by consoles than we would like. We’ll be pushing out a fix for some matchmaking issues tomorrow that will ensure that the games players are connecting to are more localized.
Since launch, many players in South America have been experiencing severe lag spikes and issues when playing Call of Duty: Black Ops 3 online. We’ve seen reports that once players have gone into a game, their ping spikes to 400 regardless of their internet. Many players have been asking for a solution, and today Treyarch has stated that they are aware of this issue and are currently working on a fix for it.
— Treyarch Studios (@Treyarch) November 18, 2015
There has been a huge Reddit thread on the Black Ops 3 sub reddit about many players in Brazil specifically experiencing issues. Treyarch’s Martin Donlon, Director of Tech, has posted in the thread about why the issue is happening:
We identified a problem last week with how the clients were matchmaking. This was causing players in regions that only have one or two datacenters (South America & Australia, mainly) to sometimes matchmaking into games in far away datacenters. This is the issue that we fixed on Thursday/Friday. Fixing this issue had the side effect of causing a load issue at our datacenter in São Paulo which we are currently working on.
Stay tuned for the latest.