Why is my internet so slow? The 10-minute diagnosis

Slow internet has exactly five common causes, and you can tell them apart in about ten minutes with nothing but a phone and the speed test built into your search engine. Work through these in order — each step rules something out — and by the end you'll know whether the fix is free (it usually is), cheap, or a plan change.

Step 1: Test at the router, then in the bad room

Run a speed test standing next to your router, then again wherever the internet "feels slow." If the router-side number roughly matches your plan but the bedroom number craters, you have a Wi-Fi problem, not an internet problem — skip to step 3. If it's slow even at the router, continue to step 2. (Test on a device connected by ethernet cable if you possibly can — it removes Wi-Fi from the equation entirely.)

Step 2: Slow everywhere? Reboot, then check the plan math

Power-cycle the modem and router — off for 30 seconds, modem first back on. It's a cliché because it works; these are small computers that run for months without a restart. Still slow? Compare your test number against the plan you're paying for (it's on your bill). Getting 80–90% of the advertised number is normal; getting 30% consistently is a provider problem — call them, because it's often a degraded line, aging modem, or an outage they haven't posted. And if you're getting 100% of a plan that's simply too small for your household, the plan is the bottleneck: our speed guide tells you in four minutes what you actually need.

Get a faster plan quoted for your address — (855) 240-4535

Step 3: The Wi-Fi fixes, in order of bang-for-buck

Move the router. Center of the home, off the floor, out of the cabinet, away from the fish tank and the microwave. This one change fixes more "slow internet" than everything else combined. Use 5 GHz. Your router broadcasts two networks; the 5 GHz one is faster and less congested at short range — connect your work devices to it. Wire what doesn't move. TV, desktop, console: ethernet frees up airtime for everything wireless. Then, and only then, consider mesh. For homes over ~1,800 sq ft or with dead zones, a mesh kit ($100–$250, owned not rented) transforms coverage. Apartment dwellers: your problem is likely channel congestion from neighbors — our renters guide has the apartment-specific playbook.

Step 4: Slow only at certain times? That's congestion or throttling

Fine at 2pm, crawling at 8pm is the signature of a congested shared network — common on cable nodes in dense areas and oversold fixed wireless. Document it: three speed tests at different evening hours, screenshots saved. If your plan has a data cap, check whether you've crossed it (some providers slow you down after). A consistent evening collapse on a capped or congested plan is a strong signal to change plan or provider — and it's exactly the evidence that makes a retention rep offer you something better.

Step 5: Old equipment quietly caps new speeds

A modem from 2018 can physically cap a 500 Mbps plan at 150. A router without Wi-Fi 6 can't deliver a gig plan to any device. If you upgraded your plan but kept your gear, the gear is now the ceiling — check the modem's DOCSIS version (3.1 for anything over ~300 Mbps) and the router's Wi-Fi generation. Owning current equipment beats renting on both performance and cost.

When the answer is: it's the plan

If you've done all five steps and evenings are still a slideshow, you've outgrown the plan or the technology at your address has been lapped — cable nodes get congested, DSL was never fast, and meanwhile fiber or 5G may have quietly arrived at your address. That check takes five minutes at (855) 240-4535: we read out every provider now serving your address, with real speeds and month-13 prices, and you'll know immediately whether switching or upgrading is the fix.

Frequently asked questions

Why is my internet slow even though I pay for fast internet?

Most often the plan is fine and the Wi-Fi is the bottleneck — router placement, 2.4 GHz congestion, or aging equipment. Test next to the router: if that number matches your plan, fix the Wi-Fi; if it doesn't, reboot equipment and then hold your provider to the advertised speed.

Why does my internet slow down at night?

Evening slowdowns are the signature of a congested shared network — many households on one cable node or wireless tower using it at once. Document with speed tests at different hours; consistent evening collapse justifies a plan change, provider switch, or a retention-deal call.

Do internet providers throttle your speed?

Some capped plans slow customers after they exceed a monthly data allowance, and congested networks slow everyone at peak times. Check your plan's data cap and the FCC broadband label. Persistent throttling below advertised speeds is worth a formal complaint and a switch.

Will a mesh Wi-Fi system speed up my internet?

It won't raise your plan's speed, but it delivers that speed to rooms that weren't getting it. For homes over roughly 1,800 sq ft, multi-story layouts, or dead zones, mesh is the highest-impact upgrade after router placement. Buy it outright rather than renting.

Keep reading: how much speed you need · modem vs router explained · apartment Wi-Fi fixes · compare faster plans