Hi!

So my setup are the following:

Main ISP's router -> 1Gb switch -> C80 Router

ISP is Parasat Fiber (300Mbps)

I just newly purchased the router as a replacement for my Tenda AC1200  since my cousin has upgraded the ISP speed from 50Mbps to 300Mbps

With my old router(Tenda), the speed is around 85-95 on both upload and download and on both LAN and Wifi which is expected since it is what it's stated in it's specification. However, when using the new router(C80), the speed is only up around 150-170Mbps for download while the upload is around 50-70Mbps. Both on LAN and Wifi. 

When I directly connect my devices to the main router, it's speed goes around 250-290Mbps(depends on what time) on either LAN or wifi and on different devices(Laptop and Phone)

Tests that I tried:

- Updating the Firmware to the latest and rebooting the router

- Tried different CAT6 Cable

- Tried directly plugging the C80 to the Main ISP's router

- Tested NaT Boost and QoS

- Disabled parental controls

Same issue persists on the steps above.

I am almost convinced that the issue might be related to the new router that I purchased. I wanted to ask you guys first if there is something that I missed before requesting to have the device replaced.

Thank you in advance!