> ## Documentation Index
> Fetch the complete documentation index at: https://docs.derekdinh.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Diagnosing and Fixing Slow Network Speeds on Your Device

> Step-by-step guidance to identify what is consuming your bandwidth and restore normal network speeds on Windows and macOS devices.

Slow network performance can be caused by a congested connection, a bandwidth-hungry background application, a poor Wi-Fi signal, or misconfigured router settings. Rather than simply restarting your router and hoping for the best, work through the steps below to pinpoint the bottleneck and apply a targeted fix.

<Steps>
  <Step title="Run a Baseline Speed Test">
    Before changing anything, establish a measured baseline so you can tell objectively whether the steps you take are making a difference.

    1. Close all applications that might be using the network (browsers, email clients, cloud sync tools).
    2. Open a browser and navigate to [speedtest.net](https://www.speedtest.net) or [fast.com](https://fast.com).
    3. Run the test and note your **download speed**, **upload speed**, and **latency (ping)**.
    4. Compare the result against the plan speed listed on your ISP contract.

    <Tip>
      Run the test twice — once over Wi-Fi and once with a direct Ethernet cable plugged into the router. A large gap between the two readings points to a Wi-Fi problem rather than an ISP or router issue.
    </Tip>

    <Note>
      A result below 50% of your contracted speed during off-peak hours (early morning, weekends) is a strong indicator of an ISP-side problem or failing hardware. Save a screenshot of the results for your escalation report.
    </Note>
  </Step>

  <Step title="Check for Bandwidth-Heavy Applications">
    A single application downloading a large update or uploading files to the cloud can saturate your connection for everyone on the network.

    **Windows — Task Manager:**

    1. Press **Ctrl + Shift + Esc** to open Task Manager.
    2. Click the **Performance** tab, then **Open Resource Monitor** at the bottom.
    3. Switch to the **Network** tab in Resource Monitor.
    4. Look at the **Processes with Network Activity** section. Sort by **Total (B/sec)** to find the top consumers.

    You can also use PowerShell to get a quick snapshot:

    ```powershell theme={null}
    # Show per-process network usage (requires administrator privileges)
    Get-NetTCPConnection | Group-Object OwningProcess |
      Select-Object Count, @{N="PID";E={$_.Name}} |
      Sort-Object Count -Descending |
      Select-Object -First 10
    ```

    **macOS — Activity Monitor:**

    1. Open **Activity Monitor** (search with Spotlight: **Cmd + Space**, then type `Activity Monitor`).
    2. Click the **Network** tab at the top.
    3. Sort by **Sent Bytes/sec** or **Rcvd Bytes/sec** to identify the heaviest process.

    ```bash theme={null}
    # Terminal alternative: show top network connections
    nettop -P -l 5
    ```

    Common culprits include: Windows Update, OneDrive/Dropbox/Google Drive sync, video conferencing software running in the background, antivirus definition updates, and game launchers.

    <Warning>
      Killing a process through Task Manager ends it immediately without saving its state. Pause cloud sync clients gracefully using their system tray icon before force-quitting them.
    </Warning>
  </Step>

  <Step title="Check Wi-Fi Signal Strength">
    Even a network capable of gigabit speeds delivers far less if your device has a weak signal to the router.

    **Windows:**

    1. Hover over the **Wi-Fi icon** in the system tray — the tooltip shows signal bars.
    2. For a numeric dBm value, run:

    ```powershell theme={null}
    netsh wlan show interfaces
    ```

    Look for the **Signal** field. A value above **70%** (roughly −65 dBm) is acceptable; below **50%** (below −75 dBm) will cause noticeable slowdowns and packet loss.

    **macOS:**

    Hold **Option** and click the **Wi-Fi menu bar icon**. A pop-up shows **RSSI** (Received Signal Strength Indicator). Aim for −70 dBm or better.

    **Improving signal strength:**

    * Move closer to the router or access point.
    * Remove physical obstructions (walls, metal shelving, microwaves) from the signal path.
    * Reposition the router to a central, elevated location with its antennas vertical.
    * Consider a Wi-Fi extender or mesh node if the problem is distance-related.

    <Note>
      Microwave ovens, baby monitors, and older Bluetooth devices operate on the 2.4 GHz band and can cause significant interference. If your router supports 5 GHz, switching to that band (see Step 4) can sidestep this interference.
    </Note>
  </Step>

  <Step title="Switch from Wi-Fi to a Wired Connection">
    A direct Ethernet connection eliminates radio interference, signal attenuation, and channel congestion in a single step.

    1. Plug one end of a **Cat5e or Cat6 Ethernet cable** into your computer's network port and the other into an available LAN port on your router.
    2. On Windows, open **Network Connections** (`ncpa.cpl`) and confirm the **Ethernet** adapter shows **Connected**.
    3. On macOS, go to **System Settings → Network** and confirm **Ethernet / USB Ethernet** is active.
    4. Re-run your speed test from Step 1 and compare the result.

    If the wired speed is dramatically better, the problem is isolated to your Wi-Fi setup. If the wired speed is also poor, the bottleneck is either the router, the modem, or the ISP.

    <Tip>
      If your laptop does not have an Ethernet port, a USB-C to Ethernet adapter or Thunderbolt dock with a built-in NIC works just as well and typically costs less than \$20.
    </Tip>
  </Step>

  <Step title="Check Router QoS Settings">
    Quality of Service (QoS) rules on your router prioritize certain types of traffic. A misconfigured QoS policy can accidentally throttle your device or your type of traffic.

    1. Open a browser and navigate to your router's admin interface. Common addresses are `192.168.1.1`, `192.168.0.1`, or `10.0.0.1`. Check the label on the underside of your router for the correct address and default credentials.
    2. Log in and locate the **QoS**, **Traffic Management**, or **Bandwidth Control** section (the label varies by manufacturer).
    3. Check whether any rules limit download or upload speed for your device's IP or MAC address.
    4. Temporarily **disable QoS entirely**, re-run your speed test, then re-enable it if QoS was not the cause.

    <Warning>
      Router admin interfaces vary widely. If you are on a corporate or managed network, do not modify router settings without explicit permission from your IT administrator. Unauthorized changes can affect all users on the network.
    </Warning>

    <Accordion title="Finding your router's admin address">
      **Windows:**

      ```powershell theme={null}
      ipconfig
      ```

      The **Default Gateway** line is your router's admin IP address.

      **macOS:**

      ```bash theme={null}
      netstat -nr | grep default
      ```

      The first `default` entry in the output shows your gateway IP.

      **Linux:**

      ```bash theme={null}
      ip route show default
      ```
    </Accordion>
  </Step>

  <Step title="Test DNS Performance">
    A slow DNS server adds latency to every new connection your browser opens. Switching to a faster public DNS resolver is free and takes about two minutes.

    First, test your current DNS response time:

    ```bash theme={null}
    # macOS / Linux
    time nslookup google.com

    # Windows (PowerShell)
    Measure-Command { Resolve-DnsName google.com }
    ```

    Compare that against a known-fast resolver:

    ```bash theme={null}
    # macOS / Linux
    time nslookup google.com 8.8.8.8    # Google Public DNS
    time nslookup google.com 1.1.1.1    # Cloudflare DNS
    ```

    If a public resolver is significantly faster, change your DNS settings:

    **Windows:**

    1. Open **Network Connections** (`ncpa.cpl`).
    2. Right-click your active adapter → **Properties → Internet Protocol Version 4 (TCP/IPv4) → Properties**.
    3. Select **Use the following DNS server addresses** and enter:
       * Preferred: `1.1.1.1`
       * Alternate: `8.8.8.8`

    **macOS:**

    1. **System Settings → Network → \[Your Interface] → Details → DNS**.
    2. Click **+** and add `1.1.1.1` and `8.8.8.8`.

    <Note>
      DNS changes take effect immediately for new connections. Already-open tabs in your browser may not benefit until you reload them.
    </Note>
  </Step>

  <Step title="Escalation Steps">
    If your speed remains well below the contracted rate after completing all steps above, it is time to involve additional support resources.

    <Accordion title="Information to collect before escalating">
      * **Speed test screenshots** (Wi-Fi and wired, before and after each major step)
      * **Router model and firmware version** (found in the router admin page under Status or About)
      * **Output of `ipconfig /all`** (Windows) or `ifconfig` (macOS)
      * **Peak vs. off-peak comparison** — does the slowdown occur only during business hours or all day?
      * **Number of affected devices** — just yours, several, or all?
      * **Recent changes** — new devices added to the network, office furniture moved near the router, OS or firmware updates
      * **ISP account details** — contracted download/upload speed tier and current billing status
    </Accordion>

    <Warning>
      Persistent slow speeds that affect only one device but not others almost always point to a hardware fault (failing NIC or adapter) or a driver issue on that specific machine. Your IT support team can run deeper hardware diagnostics that are outside the scope of these steps.
    </Warning>
  </Step>
</Steps>