How do I stop frame time spikes in Metro Awakening combat?

Frame generation in Metro Awakening jumped from 8ms to 42ms during combat. I was losing my mind. Disabling the camera in Device Manager fixed the lag but killed my stream. I used the GamePP Peripheral Driver Conflict Tool to set Razer Synapse to Manual start. RivaTuner showed the interval stabilizing at 7-11ms. CPU usage is now 62-70%, and I can backup my configuration without any interruptions.