Networking Change Regarding Chunk Loading

Previous to 1.6.2 chunks would be queued then sent later on another priority queue.

Now, it seems the behavior is that chunks are taking priority over normal packets like chat. Because of this, upon loading an area and typing /list for example, it will be delayed a good 5 seconds, regardless of the speed of the server due to the clients network connection.

This can be displayed better if you turn your speed up, and fly around, then type /list. Previously, it would function fine, but now it stalls until the chunks are fully loaded.

Was it 1.6.2 that caused this or a previous version or? It's very annoying.