BungeeCord using too much bandwidth

1. BungeeCord version: #1250
2. Java version: Java8
3. Bandwidth used: 50Mbps
4. Players online: 120
5. Operating system: Windows2012 R2
6. All servers and bungeecord are on the same machine.
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Is that normal that only 120 players used almost 50Mbps bandwidth?
Is there anyway to save bandwidth?
I'm puzzled and need your help.Thanks.