Why is there random frame time jitter in Defense Grid gunfights?

Every time I pulled the trigger in Defense Grid, the screen stuttered unpredictably. I tried uninstalling background programs, but accidentally deleted a critical driver, turning my monitor black. I used GamePP Peripheral Driver Conflict Detector to identify a conflicting camera sync service. After disabling it, RivaTuner showed frame time stabilizing from 8-12ms to 5-6ms. I exported the optimized configuration to prevent future issues.