Where is the problem with slow internet at home? Nighttime delays, room issues, and just one device check—six types of slow methods for symptom diagnosis

cousin's broadband went from 300 Mbps to 500 Mbps. After the installation was done, the technician left, and she called me: Why doesn't it feel much faster? At night, I still keep watching videos in circles. I took my laptop and stayed overnight. After testing, it wasn't just one slow place, but three places stacked together—the broadband layer was very clean, but the problem was with the WiFi layer and an old TV box. In the end, I didn't spend a single cent fixing these things.

On the way back

, I thought about it—slow internet speed is too vague. sudden network disconnection, there are and slow methods, and slow ones are different, and slow ones are categorized into several types, each with completely different root causes. I've categorized the common types of slowness into six types. If you first understand the situation before taking action, you can avoid half the detours.

Step one: Conduct two speed tests: which layer should you pin the 'slow' into

don't restart the router right away; measure the baseline line first. Find a network cable, connect the laptop directly to the router's LAN port, and run a speed test. This step tests the real speed of broadband entering the home. My gigabit broadband cable tested at 940, which is my benchmark. My cousin's 500Mbps wired test was 480, completely normal, and the broadband layer was immediately ruled out.

second time was a face-to-face test: the phone stood within one meter of the router and tested again. Rapid face-to-face movement or slow distance is a sign of illness; Getting close to the face is slow; the problem lies with the router or the superior system. Comparing the two speed tests, the six slow methods can basically cut out half the suspicion. Speed testing itself has its own rules: turn off the download from the background, use the same app, and test multiple times to get the middle value. the wrong speed measurement posture means the measured values aren't reference.

here's another simple trick not to be foolish: use another device as a reference. If your phone is slow, try switching tablets and see the same video in the same spot. If it works smoothly after switching, it means it's a device issue, not a network issue.

slow by timing: Nighttime is better, but the pot is usually not in your home

test 940 during the day and 850 at 8 p.m., dropping less than 10%. That's normal, don't mess around. Only after dropping 30% above is it worth investigating. The slowness unique to the night has two sources, separated by its own origins.

one is congestion in the district. Your line in the community shares the exit with neighbors. At night, everyone goes home, and if the exit is blocked, no matter what equipment you switch to, it won't help. The old neighborhood I've lived in is the toughest—at 9 PM, it drops from 90 trillion to 20 trillion, lively and lively during the day, all this cheap price is paid during the evening rush . The verification method is simple: during peak hours, use your phone data to play the same video, ensure smooth data, WiFi card, and consider whether neighbors are also lagging. Basically, it's a matter of local area—request repair or change carriers.

Another is channel collisions, which you can fix yourself. 2. 4G has only three non-overlapping lanes: 1, 6, and 11. At night, all neighbors are online, so collisions are very likely. My cousin's house had the router channel set to auto, but it jumped to 12 in the middle of the night, causing the vacuum cleaner cameras to lose contact all at once. later, the channel was manually pinned to 1 before it finally stopped . Install a WiFi Analyzer on your phone and take a quick look—three pillars stacked together mean you've crashed. By the way, another suspect on the dinner card is a microwave oven. It shares the same frequency band as 2.4G, and in three minutes of heating food, it can drive 2.4G from 150MB to 30MB, while 5G stays completely untouched. this is a physical , not a malfunction.

trick: Try connecting 5G when it lags at night. 5G is also laggy, area; Only 2.4G cards are available, channel, or interference.

by location: if it's just one room slow, it's the wall bill, not the broadband bill

living room is at full speed, but the bedroom is just a fraction left. This slowness has nothing to do with broadband at all—it's signal attenuation through the wall. Mobile signal bars are deceiving; check the dBm reading: anything below -60 is fine, -70 is the threshold, and don't force connections outside -75. In my home's five test locations, the living room -44, kitchen -74, bathroom -79. blind spot self-check means holding my phone and walking around the house .

here's a counterintuitive thing to say in advance: in a room separated by load-bearing walls, 5G may not necessarily be faster than 2.4G. 5G is fast at close range, but wall attenuation is much harsher than 2.4G. In the master bedroom, 5G measured 130 Mbps, while 2.4G was 240 Mbps. band selection depends on the wall , not mindless 5G connection.

disposal order from cheap to expensive: first move the router, leave the weak current box, remove the metal cabinet, move it to the center of the room, 0 yuan, often solved directly; If that's not enough, replace the old router with an AP or repeater, under 50 yuan; If that doesn't work, then it's Mesh's turn. My cousin's router is tucked at the very bottom of the entryway cabinet. I moved it to the TV counter, and the bedroom went from -78 to -63. This was even more effective than replacing a new machine.

by device slower: FamilyMart is slow, or vice versa, FamilyMart is slow and fast

FamilyMart only has one device that is slow, so check it out. Two high-risk points. First, the old device's network card only recognizes 2.4G, negotiated speed of 72M, but the actual cost is about 20MB. This number can be seen directly in the router's backend device list, with 72, 144, and 150 all signed by slow devices. Second, the speed limit of the network port itself. My cousin's old TV box was stuck here: the video app showed "slow speed," but I checked the backend and saw it was running 94 Mbps on the 100M port. The machine thought it was a network issue, but it was actually the ceiling for its own network port. Before buying TV and box network port specifications, you have to ask: many mid- and low-end devices still have 100Mbps ports today.

conversely, there's an even more hidden method: when an old device is connected, the whole family becomes stuck. My old iPad is exactly that role. As soon as it launches, the new phone spins in a circle when watching videos. This isn't mystical logic—it's WiFi queueing through a mouthwater: old devices are slow to send and still occupy the channel, while new devices are waiting for the end. these old devices should either be nailed 2.4G or thrown into the IoT private network of the old router, so they don't compete with the main devices.

There's another type where the whole family is slow but can't find a single device—someone is competing for bandwidth: a device at home is secretly uploading and downloading in the background. three steps to locate which it is, and the router's built-in data statistics are enough—no need to install anything.

slow by purpose: slow web use, video cards, and wireless devices running incompletely, each with its own

these two types of slow speeds are the most confusing because speed testing software tells you everything is normal. Downloading at 30MB/s, but the webpage takes three seconds to appear—this is DNS accounting—the address search is slow, or the carrier has answered the query quickly. The change is simple: change the DNS to 223.5.5.5 or 119.29.29.29, and one section on the optical modem side and one on the router side to change the . Don't rush to do it—use nslookup to compare before making changes, and see which layer of the parsing is actually slower. . To say the harsh facts earlier: DNS only fixes the problem of not opening and slow loading, without speeding up; after changing the download speed, the speed still returns to the original level.

speed test at 940 km/h at full speed, Bilibili still spins in circles—this is probably not your problem. The video is pulled from the platform's CDN nodes, crowded during evening rush hours, or the nodes are far away, so the lag is over there. There are two verification methods: lowering the resolution by one stop immediately smooths the resolution, which is CDN squeezing; Switching to smooth mobile data is the path from Jiakuang to the platform; traffic is blocked by the platform's own fault Don't fuss over the router like this; it's useless.

Wired fast, wireless slow: This is a matter to be

the sixth type, strictly speaking, is not considered a disease. Wired 940, phone face-to-face test 650, many people think 360 is a loss, but this is actually the physical law of wireless: negotiate 1201, actually get 50-60%, then discount through the firewall, bandwidth, negotiation, and actual testing are the three of the three books, you can't use the wired one to demand wireless. If you want to go higher with wireless power, stand closer, connect to 5G, and don't stuff the router in the cabinet—these three are more effective than anything else. If you want to consistently run a full 940 km/h, the answer is summed up in one word: the line.

Conclusion: Check the six slow methods and check them carefully

Here's how

wrapped up that night at my cousin's house: moving the router from the bottom of the cabinet to the countertop, nailing the channel shut, taking the TV box out of the 100Mbps scene and switching to the network cable port—all three things cost zero yuan. The next day, she messaged me saying the night loop was gone. So if your home internet is slow, don't order equipment yet. Follow this watch for a lap, and 80% of the time you'll be able to locate the device the same day.