No, your switch should not "cap" at ~90 Mbps. This is almost always a cable or negotiation problem.
- Troubleshooting tips: Test the speed without the switch directly on the router/modem → will you get 200/200? Test a different LAN cable (Cat5e or Cat6, four pairs throughout). Check the connection speed of your network card in Windows/Linux/Mac ("100 Mbit/s" or "1.0 Gbit/s"). Swap the ports on the switch. If all else fails → switch may be faulty.