I made this guide if I have problems such as a slow internet or bandwidth that does not match where the internet source at that time uses a router (which is generally shared with other devices around at the same time). So expect to get more maximum results by using only 1 device as a comparison with the router.
Please also ensure that the transmission media from the ISP is an RJ 45 ethernet to connect with PC / laptop devices. The topology used in the guide is as follows, and can be adjusted to the conditions at the location :

ISP <–> walljack <==> router becomes ISP <–> walljack <==> PC / laptop

<–> = transmission media

<==> = RJ 45 ethernet

1. Disconnect the ethernet connected to the router and connect it to the PC / laptop. On PCs / laptops, make sure the Ethernet status is Enable and crossed (don’t connect the LAN yet). Connect one end of the LAN cable to the walljack or last device and the other end of the cable to the PC or laptop, the LAN indicator will turn into an exclamation mark, if you still get a cross, you should check the LAN cable and the connected device.

2. In the Ciontrol Panel, select Network Connections.

3. Select New Wizard.

4. Click Next and select Connect to the Internet – Set up my manually – Connect using a broadband connection that requires a user name and password and the ISP Name can be filled with the name of the ISP then Next.

5. Fill in the user name and password provided from the ISP, then click Next.

6. Checklist Add a shortcut to this to my desktop to make it easy to click from the Desktop then Finish.

7. A pop up window will appear as follows (if the User name and Password have been filled), you can directly click on Connect and if successful, the status will appear.

Until this step we can immediately try the test to ensure the bandwidth is appropriate.

8. To disconnect, right-click the LAN icon and select Disconnect.

If you still experience slow problems or improper bandwidth, please contact the relevant ISP. Good luck and have a great day.