BF4 Unlikely Combos: Type 88 LMG/3.4x scope

https://www.youtube.com/watch?v=N1xf4AuaixA&feature=youtube_gdata_player

The monitor of frequency at the bottom left… what is it for exactly? I was watching this in class with no sound.

Performance overlay. The console command is perfoverlay.drawgraph 1

Thank you my good man