Since you have already tried several troubleshooting steps without success, it may be worth considering a few additional advanced troubleshooting steps to further investigate and potentially resolve the slow WIFI speed issue on your laptop when connected to that particular router. Here are some additional suggestions you can try:
1. **Check for Interference**: Nearby electronic devices, appliances, or even physical obstacles may be causing interference with the WIFI signal. Try moving your laptop and router to a different location to see if the WIFI performance improves.
2. **Check for Firmware Updates**: In addition to updating the router's firmware, check if there are any beta firmware updates available that may address compatibility issues with specific devices.
3. **Disable Security Software**: Temporarily disable any security software (antivirus or firewall) on your laptop to see if they are impacting WIFI performance. If disabling the security software improves speed, consider adjusting the settings or exceptions to allow better WIFI performance.
4. **Check Power Management Settings**: In addition to checking power settings, also verify the advanced power management options for the WIFI adapter. Make sure that the device is allowed to operate at its maximum performance level.
5. **Reset Network Settings**: Try resetting the network settings on your Windows 11 laptop. This can sometimes resolve temporary network issues that may be affecting WIFI speed.
6. **Check for Background Processes**: Check for any background processes or applications that may be utilizing network bandwidth. Close unnecessary applications and processes to see if it improves WIFI speed.
7. **Use a Different WIFI Adapter**: If possible, try using an external WIFI adapter on your laptop to see if the issue is specific to the built-in adapter. This can help determine if the problem lies with the laptop's hardware.
8. **Monitor WIFI Signal Strength**: Use a WIFI analyzer tool to monitor the WIFI signal strength and quality when connected to the router. This can provide insights into any signal strength issues that may be affecting speed.
If none of these steps resolve the slow WIFI speed issue on your laptop when connected to the particular router, you may want to consider contacting the manufacturer's support for both the laptop and router for further assistance or consider using an alternative WIFI connection for optimal performance.