Mileage on the HID varies, depeding on what is actually installed, and it may be corrected by the driver installed for it. My UPS (APC), cordless mouse (Logitech), USB converter (Gamemon), for my PS2 controller are in there full time, and quite a few things go under this group but aren't always connected (flight stick, steering wheel/pedals, etc) and don't have any frame skipping on my PC. If disabling them nixes the skips/dips in framerate, then you may want to look into different drivers for that device.