How to Speed Up a Slow Internet Connection on Windows 11

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PC Technician
Windows 11NetworkWi-FiPerformance

The Problem

Speed tests crawl, videos buffer, and Steam takes hours—but your phone on the same Wi-Fi feels fine. That usually means something on the PC is hogging bandwidth, DNS is slow, or you are on a weak Wi-Fi link—not that you need a new ISP tier.

Games lag but speed tests look OK? That is latency, not raw speed—read fix high ping and packet loss.

Symptoms

  • Browsers slow; other devices on the network are normal.
  • Task Manager shows high Network usage with no obvious app open.
  • Ethernet is fast; Wi-Fi is slow (or the reverse).

The Fix: Step-by-Step

Step 1: Rule Out the Basics

  1. Run a speed test on the PC (speedtest.net or fast.com) and on your phone beside the router.
  2. If both are slow, reboot the modem and router—skip the PC fixes until the line itself is healthy.
  3. Plug in Ethernet for one test. If wired is fast and Wi-Fi is slow, focus on wireless (adapter, distance, band).

Step 2: Find What Is Eating Bandwidth

  1. Ctrl + Shift + Esc → Task Manager → Processes → click Network to sort.
  2. Pause or close heavy users: OneDrive, Google Drive, Steam, Epic, Windows Update, backup tools, torrent clients.
  3. Settings → Windows Update → Advanced options → Delivery Optimization → limit Upload and Download bandwidth if updates run during work hours.

Want a clearer picture? You can see what's using your bandwidth in real time with Advanced Network Monitor—per-app upload and download at a glance.

Step 3: Use Faster DNS

ISP DNS can be sluggish or mis-route traffic.

  1. Win + R → ncpa.cpl → Enter.
  2. Right-click Wi-Fi or Ethernet → Properties → Internet Protocol Version 4 (TCP/IPv4) → Properties.
  3. Choose Use the following DNS server addresses:
    • Preferred: 1.1.1.1 (Cloudflare)
    • Alternate: 1.0.0.1
  4. Click OK. In an admin terminal: ipconfig /flushdns.

Step 4: Disable Metered Connection (If It Was On)

Metered mode throttles background sync.

  1. Settings → Network & internet → Wi-Fi → your network → Properties.
  2. Turn off Metered connection unless you truly need a data cap.

Step 5: Update the Network Adapter Driver

Old Realtek or Intel drivers cap throughput on Wi-Fi 6 routers.

  1. Device Manager → Network adapters → update the Wi-Fi or Ethernet driver from the laptop/PC vendor site.
  2. Avoid generic "driver updater" apps—they install the wrong package half the time.

Step 6: Tune Wi-Fi on the PC

  • Sit closer or use 5 GHz if the router is in the same room; use 2.4 GHz through walls.
  • In router settings, enable 802.11ax (Wi-Fi 6) only if the adapter supports it; otherwise force 802.11ac.
  • Disable VPN browser extensions and system VPN while testing—they add overhead.

Step 7: Reset Network Settings (Last Resort)

Settings → Network & internet → Advanced network settings → Network reset → Reset now. This reinstalls adapters and clears profiles—you will re-enter Wi-Fi passwords.

Realistic Expectations

You cannot make a 50 Mbps plan behave like fiber. These steps remove PC-side bottlenecks so you actually get what you pay for. If Ethernet and Wi-Fi both max out below your plan after a clean test, call the ISP with timestamped speed test screenshots.