Crashes, No Sound, or Screen Glitches?
Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteWindows Errors? Fix Them Before They Spread
Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstalliTechGuides is reader-supported. When you buy through links on our site, we may earn an affiliate commission. As an Amazon Associate I earn from qualifying purchases. Learn more
Buffering can come from the internet service reaching your home, the modem, the router, Wi-Fi conditions, a device, or congestion—not just one faulty box. Compare a speed test at the modem, over Ethernet through the router, and over Wi-Fi near the router. Where performance drops helps narrow the cause, but does not by itself prove which device is defective.
What the modem and router each do
A modem connects your home to your internet service provider (ISP); a router shares that connection with your devices. Some ISP gateways combine both functions. As a result, “modem or router?” may not be a meaningful distinction if you have a single gateway device. Google explains the roles in its modem overview.
Buffering is a symptom: video data is arriving too slowly or inconsistently for playback. The cause could be upstream of your home network, inside it, or on a single device. A router cannot create speed that the internet connection does not provide, as NETGEAR Support notes.
What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
How to locate the slowdown
Run the tests in sequence and compare results under similar conditions. Use the same speed-test service and device where practical, and note the time, connection type, and result. NETGEAR’s speed-test guidance distinguishes tests at the modem, through the router over Ethernet, and over Wi-Fi.
#1 Best Overall
- OneMesh Compatible Router - Form a seamless WiFi when work with TP-Link OneMesh WiFi Extenders
- Next-Gen Wi-Fi 6 Technology – The Archer AX10 leverages advanced Wi-Fi 6 features like OFDMA and 1024-QAM to deliver improved efficiency across your entire network. Perfect for high-bandwidth activities like streaming, gaming, and smart home connectivity.
- Next-gen Dual Band router - 300 Mbps on 2. 4 GHz (802. 11n) plus 1201 Mbps on 5 GHz (802. 11ax)
- Connect more devices than ever before - Wi-Fi 6 technology simultaneously communicates more data to more devices using OFDMA and MU-MIMO while reducing lag dramatically
- Powerful Dual-Core 900MHz Processor – Handles multiple data streams simultaneously for reliable performance across your devices. Ensures smooth streaming, online gaming, and video conferencing without buffering or lag.
- Check more than one device. Test the affected device and another device. If only one buffers, investigate that device’s Wi-Fi or Ethernet connection and capabilities before blaming shared equipment. If several devices have trouble, continue with the network tests.
- Test directly at the modem, if your ISP setup permits it. Connect a computer to the modem with Ethernet and run a speed test. Follow your provider’s instructions before disconnecting the router; some connections may require specific setup or reconnection steps. If the result is still below what you expect, check for an outage and ask the ISP to investigate the service line or account.
- Test through the router over Ethernet. Connect the same computer by Ethernet to the router and compare the result with the direct-modem test. A substantial drop here points to the router, its configuration, the cable, or a port as an area to investigate. It is not proof that the router itself has failed.
- Compare Wi-Fi near the router. Run another test close to the router, using the same device. If Ethernet is materially faster, look at wireless conditions and the device’s Wi-Fi capability. If Wi-Fi and Ethernet are both slow, the issue may lie earlier in the connection or reflect congestion.
- Repeat at another time. Note whether performance changes during busy periods and whether downloads, streams, or other high-bandwidth activity are running. A slowdown at certain times can point to congestion rather than defective hardware.
These comparisons are diagnostic clues, not a guarantee that a speed-test result will match every streaming service. NETGEAR’s slow-connection troubleshooting guide, updated July 7, 2025, also recommends comparing devices and wired and direct-modem connections.
What the results suggest
| What you observe | Where to investigate |
|---|---|
| One device buffers, but others work normally | That device’s connection, Wi-Fi capability, or local performance. |
| Direct-modem speed is low | Check ISP outages, the service line, and whether the subscribed service is delivering the expected connection. |
| Direct-modem speed is good, but Ethernet through the router is much slower | Investigate the router, its settings or capacity, and the Ethernet cable and ports. |
| Ethernet is good, but Wi-Fi is slow near the router | Investigate wireless interference, band, router placement, or client-device capability. |
| Results vary with time or concurrent activity | Check household usage and possible peak-time or ISP congestion before replacing equipment. |
For cable-modem problems, activation, the cable line, splitters, firmware, and power cycling can also matter; NETGEAR lists these in its connection troubleshooting guidance. ISP equipment and procedures vary, so use the provider’s instructions for your service.
Rank #2
- DUAL-BAND WIFI 6 ROUTER: Wi-Fi 6(802.11ax) technology achieves faster speeds, greater capacity and reduced network congestion compared to the previous gen. All WiFi routers require a separate modem. Dual-Band WiFi routers do not support the 6 GHz band.
- AX1800: Enjoy smoother and more stable streaming, gaming, downloading with 1.8 Gbps total bandwidth (up to 1200 Mbps on 5 GHz and up to 574 Mbps on 2.4 GHz). Performance varies by conditions, distance to devices, and obstacles such as walls.
- CONNECT MORE DEVICES: Wi-Fi 6 technology communicates more data to more devices simultaneously using revolutionary OFDMA technology
- EXTENSIVE COVERAGE: Achieve the strong, reliable WiFi coverage with Archer AX1800 as it focuses signal strength to your devices far away using Beamforming technology, 4 high-gain antennas and an advanced front-end module (FEM) chipset
- OUR CYBERSECURITY COMMITMENT: TP-Link is a signatory of the U.S. Cybersecurity and Infrastructure Security Agency’s (CISA) Secure-by-Design pledge. This device is designed, built, and maintained, with advanced security as a core requirement.
Check Wi-Fi, cables, and congestion before buying hardware
Wi-Fi conditions
Distance, walls and other barriers, neighboring wireless networks, frequency band, and the device’s wireless capability can all affect Wi-Fi speed. Active devices also share available capacity. Test close to the router first; then consider whether its location or nearby sources of interference could explain weaker performance elsewhere. Google covers these factors in its slow-internet troubleshooting guide.
Ethernet cable and ports
A wired test can be limited by the cable or the Ethernet ports along the path, not just by the router or ISP. For internet speeds above 100 Mbps, Google recommends Cat 5e or Cat 6 Ethernet cable in its network troubleshooting guidance. A suitable cable helps make the comparison meaningful; it does not fix a slow service connection or faulty equipment.
Rank #3
- Next-Gen Gigabit Wi-Fi 6 Speeds: 2402 Mbps on 5 GHz and 574 Mbps on 2.4 GHz bands ensure smoother streaming and faster downloads; support VPN server and VPN client¹
- A More Responsive Experience: Enjoy smooth gaming, video streaming, and live feeds simultaneously. OFDMA makes your Wi-Fi stronger by allowing multiple clients to share one band at the same time, cutting latency and jitter.²
- Expanded Wi-Fi Coverage: 4 high-gain external antennas and Beamforming technology combine to extend strong, reliable, Wi-Fi throughout your home.
- Improved Battery Life: Target Wake Time helps your devices to communicate efficiently while consuming less power.
- Improved Cooling Design: No heat ups, no throttles. A larger heat sink and redefined case design cools the WiFi 6 system and enables your network to stay at top speeds in more versatile environments.
Concurrent use and available service
Streaming, downloads, and other activity use shared bandwidth. The plan’s available speed and ISP congestion can also contribute to buffering even when equipment is working. Google’s speed examples are specific to its Nest and Google Wifi guidance: it describes 7 Mbps as enough for one HD stream while multiple simultaneous streams may buffer, and 25 Mbps as able to reliably support HD video on multiple devices. These are contextual examples, not universal requirements or guarantees for every service, device, or household. See Google’s internet-speed and connection guidance.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Restart and escalate when the tests point upstream
A restart is a reasonable first step, but it is not a diagnosis. Google’s modem restart instructions advise waiting for the internet indicator before retesting and contacting the ISP if modem problems continue. The FCC’s Consumer Guide likewise advises checking speeds, contacting the ISP about slow service or outages, and trying a router reboot.
Rank #4
- NIGHTHAWK WIFI 6 ROUTER FOR YOUR WHOLE HOME: Delivers fast, reliable WiFi across every room of your apartment or small home for streaming, gaming, video calls, and smart home devices, all running at the same time without slowing each other down.
- WORKS WITH YOUR EXISTING INTERNET SERVICE: Pairs with your existing modem or gateway via ethernet. Compatible with most cable, fiber, DSL, and satellite providers. Some gateways and modem router combos may require bridge mode. No coax needed.
- SET UP AND MANAGE YOUR NETWORK WITH THE NIGHTHAWK APP: Download the free Nighthawk app on iOS or Android for guided setup. Manage WiFi, run speed tests, pause devices, and set up guest networks from anywhere. Active internet required.
- READY FOR THE DEVICES YOU ALREADY OWN: Your phones, laptops, and TVs work right out of the box. WiFi 6 delivers speeds up to 1.8 Gbps across 2.4 GHz and 5 GHz bands. Backward compatible with WiFi 5 and earlier.
- COVERAGE IN EVERY ROOM: Covers up to 1,500 sq. ft. for up to 20 connected devices. Walls, floors, and interference can reduce range. Larger or multi-story homes may benefit from a NETGEAR Orbi mesh WiFi system.
Before replacing a modem or router, compare the test results, check for an outage, and confirm that your cables and ports can support the service speed. If a direct-modem test remains unexpectedly low, ask the ISP to check the connection; if the drop appears only after a particular network segment, investigate that segment first.
Recommended Free Tools
Quick Recap
Best Value
- 𝐆𝐢𝐠𝐚𝐛𝐢𝐭 𝐖𝐢𝐅𝐢 𝐟𝐨𝐫 𝟖𝐊 𝐒𝐭𝐫𝐞𝐚𝐦𝐢𝐧𝐠 – Up to 5400 Mbps WiFi for faster browsing, streaming, gaming and downloading, all at the same time. Performance varies by conditions, distance to devices, & obstacles such as walls.
- 𝐅𝐮𝐥𝐥 𝐅𝐞𝐚𝐭𝐮𝐫𝐞𝐝 𝐖𝐢𝐅𝐢 𝟔 𝐑𝐨𝐮𝐭𝐞𝐫 – Equipped with 4T4R and HE160 technologies on the 5 GHz band to enable max 4.8 Gbps ultra-fast connections.Power:12 V 2.5 A
- 𝐂𝐨𝐧𝐧𝐞𝐜𝐭 𝐌𝐨𝐫𝐞 𝐃𝐞𝐯𝐢𝐜𝐞𝐬 – Supports MU-MIMO and OFDMA to reduce congestion and 4X the average throughput
- 𝐄𝐱𝐭𝐞𝐧𝐬𝐢𝐯𝐞 𝐂𝐨𝐯𝐞𝐫𝐚𝐠𝐞 - Covers up to 2,000 sq. ft. High-Power FEM, 6× Antennas, Beamforming, and 4T4R structures combine to adapt WiFi coverage to perfectly fit your home and concentrate signal strength towards your devices.
- 𝐌𝐨𝐫𝐞 𝐕𝐞𝐧𝐭𝐬, 𝐋𝐞𝐬𝐬 𝐇𝐞𝐚𝐭 – Improved vented areas help unleash the full power of the router
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
