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Start with one question: is it slow everywhere, or slow in some places? Slow everywhere including next to the router means the internet connection, the modem or the router itself. Slow only in certain rooms means coverage. Slow only at certain times means congestion. Those are three different problems and one of them is not even your Wi-Fi.
The ten-minute test
Plug a laptop into the router with a cable and run a speed test. This is your line speed, with Wi-Fi removed from the equation. Compare it to what you pay for.
Now unplug and test over Wi-Fi standing next to the router. A large gap here means the router's radio is the limit.
Test in the slow room. A large gap from the previous step means coverage.
Repeat step 3 twelve hours later. A large difference between times means congestion.
Pattern
Cause
Fix
Wired speed is also well below plan
The line, the modem, or the plan
Call the provider; check the modem is rated for your tier on the provider pages
Wired is fine, Wi-Fi next to router is much slower
Update its Wi-Fi driver; disable adapter power saving
Read your four numbers against this. The first row that matches is your cause.
Scroll the table sideways to see every column.
The five real causes, in order of how often they are it
1. The router is older than the plan
This is the most common cause of "slow even next to the router". A Wi-Fi 5 router from the middle of the last decade will typically deliver well under half a gigabit in practice no matter how good your line is, and an ISP-supplied gateway from the same era is usually worse. If you upgraded your plan and nothing got faster, this is almost certainly why.
2. The house is too big for one box
Not a fault, just geometry. If the numbers are good at the router and poor two rooms away, no router replacement fixes it — you need coverage, not speed.
3. Your devices are on 2.4 GHz when they should be on 5
Devices are sticky. A phone that connected on 2.4 GHz at the far end of the house will often keep that connection when you walk back into the same room as the router. It reports full signal and delivers a fraction of the speed. Toggling Wi-Fi off and on is a free instant test: if it suddenly gets much faster, this was it.
4. Something in the house is saturating the connection
A console downloading a game, a cloud backup, a security camera uploading continuously. Check the router's device list or traffic page. It is genuinely often this, and it costs nothing to find.
5. The modem caps the plan
Specific to cable. A modem with only gigabit Ethernet ports cannot pass more than about 940 Mbps regardless of what you are paying for, so a multi-gig plan behind one is money burned. Cable operators are also retiring older DOCSIS 3.0 hardware from their approved lists — Spectrum ends DOCSIS 3.0 support entirely on 28 October 2026 — so an old modem can go from slow to unsupported.
This usually backfires
Do not upgrade the internet plan to fix slow Wi-Fi
If a room is getting 15 Mbps out of a 300 Mbps plan, the plan is not the constraint and doubling it changes nothing. Providers are happy to sell you the upgrade. Check the wired speed first: if the cable delivers close to what you pay for, every remaining problem is inside your house.
Fixes, cheapest first
Toggle Wi-Fi off and on on the slow device. Free, and it fixes the band-stickiness case instantly.
Reboot the router and the modem, in that order. Free.
Check for a download or backup eating the connection. Free.
Update the router firmware. Free, occasionally dramatic.
Replace the modem if it caps your tier. Cheap, and it may end a rental fee at the same time.
Replace the router if its radio is the limit.
Add coverage if distance is the limit. A mesh system, sized to the house rather than to the box copy.
Note that the last two are different purchases for different problems, and buying the wrong one is the single most common expensive mistake here. The four-step test above exists to stop that.
Quick picks
Ranked by our published scoring rubric (fixes slowness, setup, headroom, value). Tap any row to jump to the full write-up, or go straight to the retailer from the right-hand column. How we score.
#
Product
Best for
Score
Price
1
Illustrative
TP-Link Archer BE3600If the problem is a router from the Wi-Fi 5 era, this is the cheapest current-generation replacement that will not need replacing again soon.
Scroll the table sideways on a narrow screen. Scores are our editorial assessment from published specifications and independent testing by named outlets — not our own lab results. What we do and do not test.
The picks in full
Illustrative
#1 · An old router that has become the bottleneck
TP-Link Archer BE3600
TP-Link · Budget tier
The cheapest Wi-Fi 7 router worth owning, and it covered a 3,500 sq ft test home with more consistency than its price suggests.
Key specifications
Standard
Wi-Fi 7, dual-band
Tested coverage
A 3,500 sq ft home, consistently
Price class
Under about $100
Score 8.5/10
Fixes slowness8.5
Setup8.5
Headroom7.5
Value9.5
What it gets right
+Wi-Fi 7 efficiency features at a price that used to buy basic Wi-Fi 6
+Covered a large test home consistently, which is the metric that matters
#ad We do not publish a price we cannot verify, so the button opens Amazon's own listing. How we are funded.
Common questions
Why is my Wi-Fi slow when my internet speed is fast?+−
Because the bottleneck is between your router and your device rather than between your house and your provider. Test with an Ethernet cable: if the wired speed is close to your plan and Wi-Fi is not, the problem is the router's radio, the distance, or the band your device chose.
Why did my Wi-Fi suddenly get slow?+−
Sudden changes usually have a specific trigger: a device that started backing up or downloading, a router that auto-selected a newly congested channel, a firmware update, or a neighbor who installed something. Check the router's device and traffic list first — it is free and it is often the answer.
Will a new router make my Wi-Fi faster?+−
Only if the router is the bottleneck. It usually is when the hardware predates Wi-Fi 6 and your plan is faster than about 300 Mbps, and it usually is not when the problem is confined to particular rooms. The wired-versus-wireless test at the top of this page distinguishes the two.
Illustrative
