You may be able to pull up an in-game frame monitor using console commands. Is this the one you're talking about? I know Dragon Age Inquisition, another Frostbite game, allows you to do this, and it doesn't seem like it would go away during multiplayer. Hit Tab, then type "PerfOverlay.DrawFPS 1" (minus the quotes). To pull up frametime monitoring and graphs, type "PerfOverlay.DrawGraph 1", "PerfOverlay.DrawCPU" and "PerfOverlay.DrawGPU". To dismiss the monitor overlays, type "PerfOverlay.DrawFPS 0" and "PerfOverlay.DrawGraph 0". This in-game monitoring tools tend to be more accurate than separate monitoring applications like Fraps and MSI Afterburner, from what I've seen.