Slow Wi-Fi? Fix Dead Spots at Home for Good

Internet speed and Wi-Fi speed are two different things. What the provider delivers first reaches only the router. From there it travels on by radio to your devices, and on this last stretch, the so-called home network, the largest part of the speed very often gets lost in practice. Experts point out that the most common reason for slow internet is the Wi-Fi connection within your own home, not the connection itself (internet-navigator.de). A simple test illustrates this: connect a laptop to the router once by cable and once over Wi-Fi. If the cable connection is considerably faster, the problem lies in the home network.

Official measurements also show that the line itself is rarely the problem. On the fixed network, 85.9 percent (Federal Network Agency) of users received at least half of the contractually agreed download rate, and in 45.9 percent (Federal Network Agency) of measurements the full agreed data rate was reached or even exceeded. The data basis was around 184,000 (Federal Network Agency) fixed-network measurements in the 2024 to 2025 period. In other words: for most connections, enough arrives at the router. If too little still arrives at the device in the end, the speed is lost along the radio path.

That is good news, because the home network can be influenced, unlike the line in the ground. That is exactly why we begin the Wi-Fi optimization not with a sales pitch about new devices, but with a measurement. Only once it is clear whether the speed arrives at the router and where it is lost on the way to the device can you sensibly decide which measure truly helps.

Wi-Fi is radio, and radio waves are dampened by everything that stands between the router and the device. A light plasterboard wall costs little signal, a solid reinforced-concrete ceiling a great deal. A thick concrete wall can attenuate the signal by 20 to 50 decibels depending on its thickness (wlan-info.net), and as little as around 10 decibels already means the signal strength is halved (wlan-info.net). That explains why Wi-Fi usually works reliably in the room next to the router but noticeably drops a floor up or two walls away. Often underestimated are underfloor heating, large mirrors, mirrored glass surfaces, aquariums and even densely filled bookshelves.

A second reason is the two frequency bands. The 2.4 GHz band travels further and penetrates walls better, but it is slower and often congested in densely populated areas. The 5 GHz band is considerably faster but has a shorter range and struggles more with walls, because higher frequencies are dampened more strongly (socialsolutions.group). Anyone left with only a weak, slow signal in the next room is often stuck on the wrong band. Modern routers steer the band selection automatically, but that only succeeds if the coverage is sound to begin with.

The third factor is the neighborhood. In apartment buildings and densely built streets, many Wi-Fi networks transmit at the same time. If they sit on the same radio channel, they interfere with one another, much like several people talking in the same room at once. In the 2.4 GHz band the channels overlap heavily; in practice the cleanly usable ones are mainly channels 1, 6 and 11 (router-tipps.de). The result of channel conflicts is dropouts, stutters and fluctuating speeds, even though the signal would actually be strong enough. Which of these causes applies in your case can be clarified most reliably with a measurement in every room.

Many Wi-Fi problems do not appear overnight but grow slowly with the number of devices. A modern household today is surprisingly well connected: 46 percent (Bitkom) of people in Germany now use at least one smart-home technology, and of these smart-home users 59 percent (Bitkom) deploy more than five connected solutions. Add smartphones, tablets, TVs, speakers, robot vacuums, doorbells and printers, and in many homes a dozen or two devices quickly hang on the same Wi-Fi. Each of them shares the available capacity.

A network that was perfectly sufficient three years ago with a handful of devices thus quietly reaches its limits. This becomes noticeable above all when several devices are active at the same time, for instance simultaneous streaming, video calls and online gaming in the evening. An actually fast connection can then suddenly seem overloaded, even though in truth the home network is not distributing the load cleanly. We also look at how many devices typically come together today in the article on smart home for families.

On top of that, many routers automatically search for a free radio channel only at restart. If a new neighbor moves in over the months or further networks are added, the once-chosen channel stays in place, even if it is now overcrowded. That is how dead spots and stutters arise that seem to come out of nowhere. During the on-site diagnosis we therefore look not only at the coverage but also at how many devices actually hang on the network and how the load is distributed.

The decisive difference between blindly buying hardware and lastingly good Wi-Fi is the diagnosis. Before we even talk about a mesh system or a repeater, we measure the signal strength and the actually usable speed in every room you use. That makes visible where the signal drops, how strongly, and above all why. A packaging figure such as a certain square-meter range applies under ideal conditions without walls, in a real house with ceilings and masonry it turns out considerably lower. A brief measurement on site shows more reliably what you really need than any advertising claim.

During the measurement we cleanly separate the possible causes from one another. We check whether the full speed even arrives at the router, how far the signal reaches into each room, which radio channel your network transmits on and how congested the neighborhood is, and whether household interference is slowing the band down. Only from this overall picture does the right measure emerge. Often it turns out that a better router location or a channel change already solves the largest part of the problem, the cheapest of all solutions, which costs no new hardware.

This structured diagnosis is what distinguishes us from a pure mesh installation. Setting up a mesh set is quick, but if the actual cause is an overcrowded channel, a source of interference or a poorly placed main router, even the most expensive set helps only halfway. That is why the honest root-cause analysis comes first with us. You do not pay for devices you do not need at all, but get the measure that actually works in your home.

When the diagnosis shows that the location is right, the channel is free and a room is still not served, additional technology comes into play. Then the question arises: repeater or mesh? Both increase range but work in fundamentally different ways. A repeater receives the existing signal and retransmits it amplified. That is cheap and quick to set up, but with the simple model it often halves the speed and frequently sets up a second network with its own name, the device then stays stuck on the old network as you walk through the house.

A mesh system, by contrast, consists of several coordinated nodes that together form a single network with one name. The device automatically connects to the strongest node without you having to change anything. Which solution fits depends on the finding: if only a single room is poorly served and everything else is fine, a good repeater can be a pragmatic solution. If it is about several floors, a maze-like house or reliable work in the home office, a mesh system plays to its strengths. How a mesh system is set up and placed step by step is something we explore in the article on whole-home Wi-Fi with mesh.

When we are working on the network anyway, security is part of it. The most important foundation is a strong, individual password and a current encryption standard. The German Federal Office for Information Security recommends encryption according to the current WPA standard for home Wi-Fi networks, along with a long, hard-to-guess password (BSI). The password printed on the router sticker is a good start, but for sensitive use it should be replaced with your own.

A guest network is one of the most practical and at the same time most frequently overlooked functions of modern routers. It provides internet for visitors without giving them access to your main network and the devices logged into it. The same applies to smart-home devices such as robot vacuums, lights or cameras: if they sit in a separate network, your main network stays better protected should a single device ever have a vulnerability. On request, we set up your smart home directly with such a network separation.

Regular updates of the router firmware close known security gaps and often improve stability too. Many devices now install updates automatically; with older models an occasional manual check is worthwhile. This small routine noticeably increases the security of your network without requiring new technology, a point we discuss alongside parental controls during the technology setup for families.

During a Wi-Fi home visit we proceed in a structured way. First we measure whether the ordered speed arrives at the router, and then the coverage in every room in use. We analyze the radio channel, search for sources of interference and assess where the building fabric is hard on the signal. From this overall picture the right measure emerges: often a better location or a channel change, sometimes an additional mesh node in exactly the right spot. That way you do not pay for devices you do not need at all.

Once the technology is settled, we implement everything: we optimize the location, set the channel, place nodes in the right spots if needed, update the firmware, set up a guest network and connect your most important devices. Finally we test every room together and show you how to add new devices yourself and recognize whether a problem is the network or the connection. You get one personal contact and can simply call with later questions, without a phone queue. You will find the exact scope transparently on our pricing page.

The home-visit flat rate is 79 € for up to 60 minutes, the full Wi-Fi package with diagnosis and optimization 119 €. Travel within 10 km around Nordstemmen is included. We come to Hildesheim, Sarstedt and Nordstemmen, among others, as well as the surrounding towns in the Leine valley, see our regions. When the appointment suits you we arrange flexibly and without pressure, simply get in touch via the contact form or by phone.