Quick Answer: Start by restarting your modem and router (unplug for 30 seconds, plug modem in first). If that does not help, run a speed test via Ethernet cable to determine if the problem is your WiFi or your ISP connection. Follow the diagnostic flowchart below to systematically identify and fix the issue.
Market Context
The broadband market concentration in the United States varies based on population density and infrastructure investment. According to FCC broadband deployment data, median household income and population density are key factors in service availability and pricing. The BEAD (Broadband Equity, Access, and Deployment) program may expand options in underserved areas of the United States.
Last verified: 2026. Prices and speeds are subject to change.
Diagnostic Flowchart: Find the Cause
Before trying random fixes, identify where the problem actually is. Follow these steps in order:
- Restart your modem and router. Unplug both for 30 seconds, plug modem in first, wait 2 minutes, then plug in router. This resolves about 50% of internet issues.
- Run a speed test on a wired connection. Connect a laptop directly to your router via Ethernet cable and run a test at Speedtest.net.
- Compare result to your plan speed:
- Wired speed is normal (80%+ of plan), WiFi is slow → The problem is your WiFi. Go to "Fix WiFi Issues" below.
- Both wired and WiFi are slow → The problem is your ISP connection or modem. Go to "Fix ISP/Modem Issues" below.
- Speed is fine but pages load slowly → The problem may be DNS, your device, or specific websites. Go to "Fix Device & DNS Issues" below.
Fix WiFi Issues
If your wired speed is normal but WiFi is slow, the problem is between your router and your devices.
Move Your Router to a Better Location
- Place it in a central location on the floor where you use internet most
- Elevate it—a shelf or high furniture is better than floor level
- Avoid hiding it in closets, cabinets, or behind furniture
- Keep it away from microwaves, baby monitors, Bluetooth speakers, and cordless phones (all operate on 2.4 GHz and cause interference)
- Keep it away from metal objects, mirrors, and fish tanks (all reflect or absorb WiFi signals)
Switch WiFi Bands
| Band | Speed | Range | Best For |
|---|---|---|---|
| 2.4 GHz | Slower (up to ~200 Mbps) | Longer (through walls) | Distant devices, smart home, IoT |
| 5 GHz | Faster (up to ~1 Gbps) | Shorter (weakened by walls) | Streaming, gaming, video calls in same/nearby room |
| 6 GHz (Wi-Fi 6E) | Fastest (up to ~2 Gbps) | Shortest | High-bandwidth tasks very close to router |
If your router shows separate 2.4 GHz and 5 GHz networks, connect speed-sensitive devices to 5 GHz. If your router uses band steering (single SSID for both), check the router admin panel to ensure it is enabled.
Update Router Firmware
Log into your router admin panel (typically 192.168.1.1) and check for firmware updates. Manufacturers regularly release updates that fix performance bugs and improve WiFi stability.
Reduce WiFi Congestion
- Change your WiFi channel. In apartment buildings, dozens of routers may compete on the same channel. Use a WiFi analyzer app (like WiFi Analyzer for Android or Airport Utility for iOS) to find the least congested channel, then set it in your router admin panel.
- Limit connected devices. Each device uses bandwidth even when idle. Disconnect devices you are not using, or set up a separate IoT network for smart home devices.
Consider a Mesh System or Extender
If your home is larger than 1,500 sq ft or has multiple floors, a single router may not provide adequate coverage. See our guide to extending WiFi range for mesh vs. extender comparisons and recommendations.
Fix ISP/Modem Issues
If speeds are slow even on a wired connection, the problem is upstream of your router.
Check Your Modem
- Is your modem old? Modems older than 5 years may not support your current plan speed. Check the DOCSIS version—you need DOCSIS 3.1 for plans over 300 Mbps.
- Check signal levels. Log into your modem admin panel and look for signal-to-noise ratio (SNR) and power levels. SNR below 30 dB or power levels outside -7 to +7 dBmV indicate a line issue your ISP needs to fix.
- Check for overheating. Modems in enclosed spaces can overheat and throttle performance. Ensure adequate ventilation.
Check for Network Congestion
- Test at different times of day. If speeds are normal in the morning but slow from 7–10 PM, you are experiencing peak-hour congestion.
- Cable internet is most susceptible to neighborhood congestion because bandwidth is shared. Fiber internet does not have this issue.
- If peak-hour speeds are consistently 50% or less of your plan speed, contact your ISP or consider switching providers.
Contact Your ISP
Before calling, have this information ready:
- Speed test results (with dates, times, and whether wired or WiFi)
- Your plan speed and monthly cost
- Steps you have already tried
Ask the ISP to check your line signal levels remotely and refresh your modem provisioning. If the issue persists, request a technician visit. If your ISP cannot resolve the problem, use our guide to switching providers.
Fix Device and DNS Issues
If speed tests show normal results but browsing still feels slow:
Switch to a Faster DNS
Your ISP's default DNS servers are often slow. Switching to a public DNS can reduce page load times by 10–30%:
| DNS Provider | Primary | Secondary | Notes |
|---|---|---|---|
| Cloudflare | 1.1.1.1 | 1.0.0.1 | Fastest public DNS, privacy-focused |
| 8.8.8.8 | 8.8.4.4 | Reliable, widely used | |
| Quad9 | 9.9.9.9 | 149.112.112.112 | Security-focused, blocks malicious domains |
You can change DNS in your router settings (applies to all devices) or in individual device network settings.
Clear Browser Cache and Extensions
- Clear your browser cache and cookies (Settings → Privacy → Clear browsing data)
- Disable browser extensions one by one to identify any that slow page loads
- Try a different browser to rule out browser-specific issues
Check for Malware
Malware can consume bandwidth by sending data in the background. Run a full antivirus scan if speeds are slow on one specific device but normal on others.
ISP-Specific Troubleshooting Tips
| ISP | Common Issue | Fix |
|---|---|---|
| Xfinity | Gateway overheating, congestion | Buy own modem/router; switch to bridge mode |
| Spectrum | Outdated modem provided | Request free modem upgrade (they provide DOCSIS 3.1) |
| AT&T Fiber | BGW320 gateway WiFi weak | Enable IP Passthrough, use your own router |
| Verizon Fios | Router placement in basement | Move router or add mesh WiFi |
| Cox | Peak-hour congestion | Request node split or consider 5G home internet |
Frequently Asked Questions
Why is my internet slow only at night?
Evening hours (7–10 PM) are peak usage time in most neighborhoods. Cable internet shares bandwidth with your neighbors, so speeds drop when everyone is streaming simultaneously. Fiber internet does not have this problem. If peak-hour slowdowns are severe, consider switching to fiber or 5G.
Will a new router fix slow internet?
A new router fixes slow WiFi speeds but not slow ISP speeds. If your speed test over Ethernet matches your plan speed, a router upgrade (especially from Wi-Fi 5 to Wi-Fi 6) can significantly improve wireless performance. If wired speeds are also slow, the problem is your ISP or modem, not your router.
How do I know if my ISP is throttling my speed?
Run speed tests at different times and compare results. If speeds are consistently slow only during peak hours or when using specific services (like streaming), throttling may be occurring. Use a VPN and re-run the test—if speeds improve with a VPN, your ISP may be throttling specific traffic types. File a complaint with the FCC if you suspect unfair throttling.
Does weather affect internet speed?
For cable and fiber, no. For fixed wireless and satellite, yes—rain, snow, and dense fog can reduce speeds by 10–30%. DSL can be affected by flooding that impacts phone lines. If weather regularly impacts your connection, fiber internet is the most weather-resistant option.
Should I reset my router every day?
No. Modern routers should not need daily restarts. If yours does, it may be overheating (improve ventilation), running outdated firmware (update it), or failing (replace it). A monthly restart is sufficient for maintenance.
Advanced QoS Settings for Prioritizing Traffic
Quality of Service (QoS) lets you tell your router which devices and applications get priority bandwidth. This is especially valuable when multiple people share the same connection.
How to Enable QoS
- Log into your router admin panel (typically 192.168.1.1 or 192.168.0.1 in your browser)
- Look for QoS, Traffic Management, or Bandwidth Control in the settings
- Enable QoS and choose your prioritization method:
- Device-based: Give your work laptop or gaming console the highest priority
- Application-based: Prioritize video calls (Zoom, Teams) and gaming over file downloads
- Upload vs. download: Prioritize upload bandwidth for video calls if your plan has limited upload speed
- Set your total download and upload speed to about 85% of your plan speed (this prevents your router from overloading the connection)
Recommended QoS Priority Order
| Priority | Traffic Type | Examples |
|---|---|---|
| Highest | Real-time communication | Zoom, Teams, FaceTime, VoIP |
| High | Interactive applications | Online gaming, web browsing, remote desktop |
| Medium | Streaming video | Netflix, YouTube, Disney+, Hulu |
| Low | Background transfers | Cloud backup, app updates, torrents, large downloads |
With QoS configured properly, your video calls will stay smooth even if someone else in the house is downloading a large game update.
Speed Benchmarks: What You Should Expect
Use this table to determine whether your speed test results indicate a genuine problem or normal performance for your connection type:
| Connection Type | Advertised Speed | Realistic Wired Speed | Realistic WiFi Speed | Peak-Hour Drop |
|---|---|---|---|---|
| Cable (DOCSIS 3.1) | 300 Mbps | 270–300 Mbps | 150–250 Mbps | 15–40% |
| Cable (DOCSIS 3.1) | 1 Gbps | 800–940 Mbps | 300–600 Mbps | 15–40% |
| Fiber (GPON) | 1 Gbps | 900–940 Mbps | 400–700 Mbps | 0–5% |
| Fiber (XGS-PON) | 2 Gbps | 1.8–2.0 Gbps | 600–1,200 Mbps | 0–5% |
| 5G Home Internet | 100–300 Mbps | 80–250 Mbps | 60–200 Mbps | 10–30% |
| DSL (VDSL2) | 100 Mbps | 50–80 Mbps | 30–60 Mbps | 5–15% |
| Satellite (Starlink) | 50–200 Mbps | 40–180 Mbps | 30–150 Mbps | 20–50% |
If your wired speed is within the "Realistic Wired Speed" range, your ISP connection is functioning normally. Focus WiFi-specific fixes instead. If wired speeds fall below these ranges consistently, contact your ISP.
Network Security Check: Unauthorized Devices
Slow internet can sometimes be caused by unauthorized devices using your WiFi. Here is how to check and secure your network:
- Check connected devices. Log into your router admin panel and look for "Connected Devices" or "Client List." Count how many devices are connected and identify any you do not recognize.
- Change your WiFi password if you see unknown devices. Use WPA3 encryption if your router supports it; WPA2-AES at minimum.
- Disable WPS (WiFi Protected Setup). WPS has known security vulnerabilities that allow neighbors to connect to your network without your password.
- Enable MAC address filtering as an additional layer of protection if your router supports it. This restricts connections to only approved devices.
In apartment buildings, it is not uncommon for neighbors to accidentally (or intentionally) connect to your WiFi if you use a simple password. A strong, unique WiFi password eliminates this issue.
When Slow Internet Means It Is Time to Upgrade
Some slow-internet problems cannot be fixed with troubleshooting — they require an upgrade to your plan, equipment, or provider:
- Your plan speed is under 100 Mbps and you have 3+ people in the household: Multiple devices streaming, video calling, and browsing simultaneously need at least 200–300 Mbps. Use our speed recommendation guide to find the right tier.
- Your upload speed is under 10 Mbps and you work from home: Video calls need at least 5 Mbps upload per participant. Cable internet rarely exceeds 20–35 Mbps upload. Fiber internet provides symmetrical upload and download speeds.
- You experience peak-hour slowdowns every evening on cable: This is neighborhood congestion that your ISP must resolve by splitting the local node. If they will not, switching to fiber or 5G eliminates the problem permanently.
- Your router is more than 5 years old: Older routers lack Wi-Fi 6 support, modern security protocols, and the processing power to handle today's device counts. A $100–$150 Wi-Fi 6 router can transform your WiFi experience.
- You have more than 15 connected devices on a non-mesh router: Smart home devices, phones, tablets, laptops, TVs, and game consoles add up quickly. A mesh WiFi system handles 50–100+ devices without breaking a sweat.