01.Why strangers on your Wi-Fi make your PC Slow?
Often you optimize the entire Windows 11, but your ping in games or download speed continues to fluctuate. The reason may be in your router: unknown devices (neighbors' cell phones, third-party smart TVs) consuming your bandwidth.
This 'parasite' traffic generates Bufferbloat, which is when your network becomes congested with packet requests, forcing your network card and Windows to work double time to manage routes. Identifying and banning these devices is vital for your global performance.
Golden Command: ARP -A
Open CMD (Command Prompt) and type arp -a. Windows will list all IP and MAC addresses that are interacting with your local network right now. If there are more devices than you have at home, you have an intruder.
Don't do it Manually.
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02.Native Windows 11 Network Security
Windows 11 has a 'Network Discovery' feature that allows you to see connected devices. However, your network profile must be set to Private for the system to scan the environment without the Firewall blocking the view.
Path: Network and Sharing Center > Advanced sharing settings > Network discovery.
03.Network Protection with Voltris Optimizer
**Voltris Optimizer** shields your connection through Network Shield and DNS Protection.
- **Net Tweak:** Optimizes your wireless card packets to avoid interference from neighboring networks.
- **DNS Protection:** Prevents malicious sites from accessing your router configuration via DNS attacks.
- **Background Sync Killer:** Disables Windows processes that 'share' network data with other users on the web automatically.
Don't do it Manually.
Voltris Optimizer automates this entire guide and removes Windows delay in seconds.
Written by a verified expert
Douglas Felipe M. Gonçalves
Expert in Windows system optimization with years of experience in hardware diagnostics, kernel tuning, and advanced technical support. Founder of Voltris and developer of the Voltris Optimizer.
Meet the Voltris TeamConclusion and Next Steps
By following this guide on How to Find Out Who Is Using Your Wi-Fi via Windows 11 (2026), you are equipped with the verified technical knowledge to solve this issue with confidence.
If you still have difficulties after following all steps, our expert support team is available for a personalized remote diagnosis. Every system is unique and may require a specific approach.