In a game update earlier in the year, DICE added a couple of in-game icons that would assist with diagnosing network issues.
This first icon indicates that your connection to the server is lagging. There can be several reasons for this. For example, it could mean that someone else is using your connection while you are playing, but it could also mean that there is a network problem that occurred somewhere between you and the server. The effect of such lag is that it will take a bit longer for you to see what is happening in the game world. If this icon is frequently blinking, you might want to try a different server or see if you can decrease the load on your Internet connection.
The second icon indicates packet loss. When you see this icon, your connection to the server is experiencing lost packets, which means that information is failing to reach its destination, either when your game client sends it to the server or when the server sends the information to you. Please keep in mind that packets always get lost on the Internet and that you should not be alarmed if you’re seeing this icon blinking once or twice. If you have a large amount of packet loss and see the icon often, you will probably experience game “hiccups” sometimes – action will stop for a moment, then speed ahead to catch up.
These icons are also used on the System Performance Test screen with the former representing Latency and the latter Packet Loss (as you’d expect). Therefore, if any of these icons are plaguing you during a game don’t forget to use the System Performance Test screen to gather further information.