Hello @3mperor ,

Welcome to our community.

May I know if your network topology diagram is as follows:

ISP modem—router )))((( client devices

(Note: — stands for wired connection,)))((( stands for wireless connection )

Looks like that you're experiencing significant latency spikes (300-1000ms) when pinging your router's IP address (192.168.0.1) from your wired LAN connection, and these spikes only occur when WiFi is enabled on either 2.4GHz or 5GHz bands. When you disable WiFi completely, the latency returns to normal (0.5-3ms). You've already tried firmware updates, different cables, and factory reset without success.

Here are some steps that may help:

1. Check WiFi channel interference:
• Log into your router's web interface (http://tplinkwifi.net)
• Go to Advanced > Wireless > Wireless Settings
• Try different WiFi channels to avoid interference from nearby networks. Test various channels to find the best one for your environment
• For 2.4GHz, set the channel width to 20MHz
• For 5GHz, set the channel width to 80MHz or 40MHz

2. Adjust WiFi settings to reduce CPU load:
• In the web interface, go to Advanced > Wireless Settings
• Consider reducing the transmit power if you have a small area to cover
• Disable any bandwidth-intensive features like guest networks if not needed

3. Check for continuous high CPU usage:
• Access the web interface and monitor if the CPU usage remains at or near 100% continuously (not just brief spikes)
• Brief CPU spikes are normal

4. Disable certain features that may affect performance:
• Go to Advanced > QoS and ensure QoS is disabled
• Go to Advanced > NAT Forwarding > UPNP and disable UPNP
• Go to Advanced > Security and disable SIP ALG