Internet problem

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Hello everyone, thank you for clicking on my post, Im currently occurring a weird internet problem.

Let me explain.

First, when I connect my modem to my PC, my internet speed on PC can be up to 2.5Gbps. However, once I connect my Modem to my router and connect to my PC, unfortunately it can only run up to 1Gbps. And im wondering how can i get up to 2.5Gbps while connecting my modem to PC via the router??