@icaru 

Okay, I understand that you are experiencing very slow or timed-out connections when your computer connects to the 'Deco lr' Wi-Fi network, which is provided by your Deco Mesh system. The main Deco is connected via Ethernet to your cable modem, and the second Deco unit is in another room. Let's go through some troubleshooting steps to help improve your Deco Mesh network speed and reliability:

1. Test Your Internet Speed Directly
• First, connect your computer directly to your cable modem using an Ethernet cable and run a speed test at https://www.speedtest.net. This will confirm whether your Internet service from your provider is working as expected.

2. Check Wired Connection to Main Deco
• Connect your computer directly to the main Deco unit using an Ethernet cable. Make sure the cable is CAT5E or above. Run another speed test to see if the Deco is delivering the expected speed.

3. Wireless Speed Testing
• When testing the Wi-Fi speed, ensure your computer or phone is connected to the nearest Deco unit (not too far from the satellite Deco). Try to connect to the 5GHz band for higher speeds, if available.
• Make sure no other devices are using heavy bandwidth (like streaming or downloading) during your test.

4. Check Ethernet Backhaul and Placement
• If your second Deco is connected via Ethernet to the main Deco, ensure all cables are CAT5E or above and securely plugged in.
• If the second Deco is connected wirelessly, try moving it closer to the main Deco to improve the signal.

5. Deco App Settings
• Open the Deco app and go to MORE > ECO Mode. Make sure ECO Mode is disabled.
• Go to MORE > QoS and ensure QoS is disabled or set to standard, with no priority devices selected.
• Go to MORE > Advanced > NAT forwarding and disable SIP ALG and UPnP.

6. Try Different Speedtest Servers
• Sometimes, switching to a different speedtest server can show better results.

If you still experience slow speeds or timeouts after these steps, please refer to this FAQ for more detailed troubleshooting: https://www.tp-link.com/support/faq/2429/

If the issue persists, contact TP-Link support and provide the results of the above troubleshooting steps so we can assist you further.