The hotel's optical fiber network speed is unstable.

You didn't explain the fiber bandwidth. If it is 100 megabit, your download speed is ridiculously slow.

Also, the download speed is related to the quality of the resources you download. Poor quality of resources will also cause slow download speed!

There is a simple way to improve the network speed, the steps are as follows

1. Run the Group Policy Editor (gpedit.msc). In the local computer strategy, gradually expand the branch of computer configuration → management template → network → "QoS packet scheduler". The QoS Packet Scheduler policy will appear on the right side of the screen. Then click "Limit reserved bandwidth" of the sub-project on the right. At this point, a detailed description of "Limit reserved bandwidth" will be displayed on the left. From here, we can learn some basic information about "limiting reserved bandwidth". Once you know it, you can set "Limit Reserved Bandwidth". Click "Properties" next to "Display" under "Restrict Reserved Bandwidth" (or select the sub-item "Restrict Reserved Bandwidth", and then right-click → Properties) to open the "Restrict Reserved Bandwidth" dialog box. Click "Description" first, and then learn more about "Restrict Reserved Bandwidth" to determine the percentage of connection bandwidth that the system can reserve.

Then we can set another 20% bandwidth. Click "Settings". Settings give us three choices (not configured, enabled and disabled). Select Enable, then set the% next to the bandwidth limit to 0%, and then press OK to exit.

2. Click Start → Connect to → Show all connections.

Select the established connection, right-click Properties, and then click Network in the Connection Properties that appear. In the displayed network dialog box, check whether "QoS Packet Scheduler" is checked in "This connection uses the following items". If there are no problems, click OK to exit.

3. Finally, restart the system to complete the utilization of the other 20% bandwidth.