why did my download speed suddenly drop

Hi @Vilgsal,

Welcome to the Zyxel Community!

To help us better understand your use case and investigate further, could you please provide a bit more detail?

• What is the exact product model and firmware version of your Zyxel device?
• What is your network topology, and how is your device connected?
• How did you perform the test? Kindly share some screenshots showing what you observed, since you mentioned that the speed has dropped.
• Are the affected devices that are experiencing slower speeds wired or wireless?
• Is the slowdown affecting all devices, or only specific clients?
• Did this issue occur after you made any configuration changes, or was it previously working fine and the speed drop happened without any adjustments?
• Additionally, if you are managing your Zyxel device via Nebula, please enable Zyxel Support Access so we can review the device directly.

We look forward to receiving the additional information so that we can provide you with more precise troubleshooting instructions.