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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11Slow internet usually comes from one of eight places: the Wi-Fi link between your device and router, other traffic on your network, the service your provider delivers, the modem or router, a cable or port in the wired path, the device itself, or the speed test you are using to judge the connection. You can usually tell which one is responsible with a few comparisons that cost nothing: test near the router against the room where the problem happens, test over Ethernet against Wi-Fi, and test a second device. Those results tell you where to look before you spend money on hardware.
The eight causes, and how each one shows up
The causes below are listed in the order most home networks are best checked, starting with the parts you can control most easily. Each one includes the symptom that points toward it.
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1. The device is too far from the router
Wi-Fi throughput generally falls as the distance between a device and the router grows. The clearest sign is a connection that is fast in the same room as the router and noticeably slower in bedrooms or at the far end of a house. Placement also matters at the router itself. Google’s help guidance for its Nest Wifi and Google Wifi systems recommends a central, open spot and warns against putting the router inside a cabinet or surrounding it with objects.
Do these 3 things before closing this tab:
1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problems2. Walls and obstructions weaken the signal
Walls, floors, metal objects, and dense materials between the router and a device absorb and reflect Wi-Fi signals. This cause looks similar to distance, but it is sometimes more localized: a device that is physically closer may still be slow if a thick wall or appliance sits in the line between them. Google Fiber’s Wi-Fi guidance makes the same point about obstructions and placement.
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Coverage add-ons can help here, with conditions. A mesh point placed where it still receives a strong signal from the main router can extend coverage. A range extender placed too far from the router can deliver slower speeds than the connection it is repeating, so check its signal and the speed you get after installing it.
3. Other devices and nearby networks compete for capacity
Your connection is shared. A video call, a large download, a cloud backup, or a game update running on another device can take most of the available bandwidth, and the slowdown appears on the device you are testing. Interference from neighboring Wi-Fi networks and other wireless sources can also reduce throughput, especially on crowded channels. The FCC’s consumer guidance lists household Wi-Fi device contention as a common cause of slow service, so check what else is running before you assume the problem is external.
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4. The provider’s service is congested, down, or limited by your plan
Some slowdowns start outside your home. Your plan sets a maximum speed, congestion on the provider’s network can vary by time of day, and maintenance or outages can cause temporary drops. The signs that point here are slow results on every device, slow results over a wired Ethernet connection, and speeds that are consistently below what your plan advertises. Google’s guidance on speed tests notes that the plan speed is the figure to compare against, and that results can differ depending on the test server used.
5. The modem or router needs a restart or replacement
A modem or router that has been running for a long time, or one that has lost sync with the provider, can deliver unstable or reduced speeds. A restart often clears the problem, and it costs nothing to try. Follow the manufacturer’s or provider’s instructions, allow the device to reconnect fully, and then retest. If the problem returns, contact your provider, particularly if the modem is one they supplied. A restart is a diagnostic step, not a permanent fix.
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6. A cable, port, or upstream device caps the speed
A wired connection runs at the speed of its weakest link. Every cable, port, switch, and the modem or router itself has a rated capability, and the lowest rating in the chain sets the ceiling. Google’s Nest Wifi guidance recommends Cat 5e or Cat 6 cable for internet speeds above 100 Mbps. That is a minimum-spec guideline, not a promise that a new cable will fix a slow connection. Replace a cable only when its rating is a plausible limit for your plan, and retest the same path afterward.
7. The device is slow or has limited Wi-Fi capability
Older devices may support only older wireless standards, have weak Wi-Fi adapters, or run software that consumes processing power and bandwidth. The usual signature is a single device that is slow while others on the same network perform normally. Microsoft’s guidance for Windows Wi-Fi problems recommends comparing the wireless connection with a direct Ethernet connection to determine whether the router or the computer is responsible, and checking for background applications that consume bandwidth.
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8. The speed test itself is misleading
Speed tests measure a specific route to a specific server at a specific moment. Results vary with the server chosen, the route, the device running the test, and current congestion. A single low reading does not prove a fault, and a single high reading does not prove everyday performance is fine. The FCC’s consumer guidance recommends using the same device and test method over time, and noting whether the test runs from the router or from a device. Judge the connection by a pattern of results, not one number.
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Run these steps in order. Each one rules out a set of causes, so you do not need to work through every item in the list above.
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- Test near the router, then from the slow room. Use the same device and the same speed test for both. A large gap points to Wi-Fi coverage, placement, or obstructions (causes 1 and 2).
- Test over Ethernet if you can. If the wired result is much faster than Wi-Fi, focus on the wireless side: placement, interference, router capability, and device compatibility (causes 1, 2, 3, and 7). If the wired result is also slow, the problem is in the service, the modem, the plan, or the wired equipment (causes 4, 5, and 6).
- Test a second device. If only one device is slow, look at that device’s Wi-Fi capability, its software, and its background activity (cause 7). If every device is slow, the cause is more likely shared (causes 3 through 5).
- Pause large downloads, streams, and backups, then retest. Concurrent use is a common and easily overlooked cause (cause 3).
- Check the ratings of the cable and ports in the wired path if a wired connection seems capped below your plan speed (cause 6).
- Restart the modem and router using the manufacturer’s or provider’s instructions, then retest (cause 5).
- Check for an outage and contact your provider if slow results persist across devices and over Ethernet (cause 4).
Matching the fix to the bottleneck
No single purchase solves slow internet. The table below shows which fix fits which diagnosis and what to check before spending money.
| Fix | Bottleneck it addresses | What to check first | Limits |
|---|---|---|---|
| Move or unobstruct the router | Distance, walls, or nearby objects (causes 1 and 2) | Retest from the same room after moving it | Costs nothing, but may not reach distant rooms |
| Mesh point | Weak coverage in a distant area (causes 1 and 2) | The point must receive a strong signal from the main router where it is placed | Does not increase the plan’s speed; performance depends on placement |
| Range extender | Weak coverage in a distant area (causes 1 and 2) | Place it where the signal from the router is still strong; retest speed after installation | Placed too far from the router, it can deliver slower speeds |
| Ethernet cable rated for your plan | A cable or port that caps a wired link (cause 6) | Cat 5e or Cat 6 is the minimum Google’s guidance cites for speeds above 100 Mbps | Does not fix service, plan, or device problems |
| Router replacement | Router capability is implicated by tests (cause 5 or 7) | Wired tests and a Wi-Fi comparison point to the router, not the device or service | Does not help if the plan or provider is the limit |
| Modem restart or replacement | Unstable or reduced speeds from the modem (cause 5) | Restart first; contact the provider if the modem is provider-supplied | Replacement details depend on the provider’s equipment policy, which is not stated in the sources reviewed |
| Plan upgrade or provider support | Plan limits, recurring congestion, or line issues (cause 4) | Wired results below your plan speed, or repeated slowdowns across devices | Availability and pricing vary by provider and location; check with your provider |
When to contact your provider
Call your provider when results stay low across several devices, when wired tests fall well below your plan speed, or when the problem recurs at the same times of day. Ask three specific questions: whether the problem is local to your home or affects the area, whether your plan supports the speed you are paying for, and whether the modem or the line into your home is involved. Keep a short log of test results, including the device, the connection type, the time, and the test site, so the provider has concrete data to work with.
Sources used for this guide include Google’s help pages for Nest Wifi and Google Wifi troubleshooting and speed testing, Google Fiber Help’s Wi-Fi speed guidance, Microsoft Support’s article “Fix Wi-Fi connection issues in Windows,” the FCC’s Consumer Guide, and the FCC’s 13th Measuring Broadband America fixed broadband report (2024), which describes how bottlenecks can arise across the provider, external networks, home Wi-Fi, and devices or applications.
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