Check WiFi Speed: Why is my wifi slow all of a sudden

Sep 28, 2021 - Views: 1842 - this post if you find it interesting!

You run some WiFi speed checks and get quite low results that don’t match our internet plan? Then you doubt the service’s quality of your ISP or your mobile carrier. Wait a minute! That might not be their problem as there are other factors also affecting your Wi-Fi speed. Check out this article “Check WiFi Speed: Why is my wifi slow all of a sudden” to know more!


Slow and sluggish WiFi is so frustrating and inconvenient for us to engage in most online activities. Sluggish internet connection, of course, results in poor speed test results. With a certain number of Wi-Fi speed checks, you will know how strong your wireless connection really is. In case you see that your Wi-Fi speed is much lower than the wired speed, then the problems here might not be from your Internet Service Provider (ISP). Do you know that your Wi-Fi signal strength is affected by many different factors? Let’s check out the top reasons for slow Wi-Fi connection right below here to see if there are any of them causing your WiFi signal to be weaker than it would be.

check wifi speed

With just some WiFi speed checks, you will know how strong your wireless connection is

Check WiFi Speed: Distance to the router

WiFi signal originates from the router and travels through the air to your devices within a certain range. So, the farther the distance, the weaker the WiFi signal and the slower network speed.

That means if your devices are too far from the router, then, of course, they won’t be able to get the full signal strength as well as the fast internet speed. Similarly, if you run speed tests to check Wifi speed at a place that is quite far from the router, then you will likely get poor results.

Building materials and physical obstacles

Materials like concrete and metal are one of the biggest reasons causing slow Wi-Fi. That is because the Wi-Fi signal is easily disrupted by brick, concrete, wood, drywall, metals, and other building materials.

They can be considered ''blockers'' that block or interrupt your Wi-Fi signal as it is transmitted through the air and has to pass through these types of materials to get to your devices. In short, the more walls and physical obstacles the Wi-Fi signal has to travel through, the weaker it will become.

Too many devices using the network at the same time

Many devices connected to your WiFi network at a time is also the cause for a huge decrease in WiFi speed, especially if they are joining in bandwidth-heavy activities like streaming Netflix or online gaming. Well, if you check Wifi speed at hours when your internal WiFi traffic is overloaded, then you will find your speed test results are much slower than usual.

Router positioning: High vs Low

Placing your router on low positions such as on the ground or the bottom of the shelf or even behind other furniture is a direct way of hindering WiFi connection. It’s so hard for your WiFi signals to easily penetrate if the router is placed at low positions.

Instead of that, you should put the router as high up as possible that helps extend the broadcasting range of your wireless signal. You can run speed checks to see if the change of router height and position can help improve your Wi-Fi performance.

check wifi speed

The best position for a router

Wireless interference

Wireless signals are all around us. Electronic devices, Wi-Fi routers, cell towers, satellites, and more are the sources of wireless signals. Though the Wi-Fi signal is supposed to not have the same frequency as these other devices, the radio noise can still cause interference.

Besides, there are devices and appliances such as Bluetooth devices, microwaves, cordless phones, etc, running on the frequency range of 2.4 GHz, which is close to or at the same 2.4 GHz Wi-Fi band. So, there are times when the frequency of these devices can overlap with the frequency of Wi-Fi signals.

And when that happens, the data transmitted via a WiFi connection is likely disrupted. Well, when you have many things running on the same frequency range, then the results you’ll get when running tests to check WiFi speed tend to be much lower than the wired speed test results.

Have not rebooted the router for a long time

Most electronic devices and equipment were not made to run continuously and your router is not the exception. If it’s been so long since the last time you reboot your router, then this might be the reason causing your Wi-Fi speed to slow down.

Try restarting your router and run a speed check again to see if your Wi-Fi speed test results are higher or not. Sometimes, a simple reboot is what you need to do to help it return to peak performance.

check wifi speed

Check WiFi speed: why does my modem take so long to connect

Your devices are not able to handle advanced Wi-Fi speeds

Many times, what causes your Wi-Fi speed to slow down might not be your router, but your own devices. Your PCs, smartphones, and tablets, them has different speed capabilities. Your Wi-Fi speed is just as fast as the speed of your devices. That means no matter how fast the router is, it can’t go faster than your devices’ speed, especially if the devices you use are older than 5 years old. 

In fact, though newer devices will typically have higher internet connection speeds than older ones, they still may not be able to reach the same speed as a wired connection. You can run tests to check WiFi speed and compare the differences in internet speed results between your old and new devices.

Old router

Last but not least, using an old router might be one of the reasons for lowering your WiFi speed. The routers that age for more than 5 years might not be able to fully support high-speed internet. That’s why you should consider upgrading your router if you are sure that it’s the big cause of low WiFi speed.

Running speed tests is always a good idea to know your current Wi-Fi speed. Together with common testing tools available on the market these days like,, or, …,  MySpeed is also a great speed check tool for you to try. Try it now to see how fast your speed is!

To know more about how to check WiFi speed, you can check out here.


They are 8 common reasons causing your WiFi speed to slow down. Of course, in addition to these reasons, there are many other causes for decreases in the speed of your WiFi connection. What we mentioned above are just very common ones that a lot of us are likely experiencing in daily life. Finally, we hope that you find today’s article “Check WiFi Speed: Why is my wifi slow all of a sudden” and its information interesting and useful!