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Scan for viruses
If you ask yourself "why my Internet is so slow," it is possible that a virus is slowing down your computer and the Internet speed. In this case, removing the virus should be all you need to do, to make your computer fast again.
Maybe your smartphone's or tablet's Internet speed is slow, because an application that became unresponsive might be slowing down your mobile device (and your Internet speed). Consider restarting your mobile device, as a way of improving your Internet speed.
Place the router away from other electronic devices
Another reason for a slow Internet connection is the place where the router is positioned. Things like TV's, microwaves, computers, things that have a motor inside, and other electronics can interfere with the router's signal and make it weaker.
Place your router away from other electronic devices. In that way, the signal will be stronger and the Internet speed faster.
If the current Internet speed doesn't match with the one you pay for, report the problem to the ISP.
If they match, then there is a different issue, such as a virus (check out the viruses/spywares/malware solutions which should help you remove it), or the internet plan doesn't meet your requirements and needs and you should consider upgrading it.
If you decide to upgade the Internet plan, make sure to think carefully about what you need the Internet connection for (games, streaming, watching TV channels, browsing the net only, office business, programming etc.). For instance, If you are a gamer, you need a larger Internet traffic (more than 100 GB or unlimited), low ping value, and high download speed (around 20 - 30 Mbps).
An average Internet speed (10 - 20 Mbps Download speed) should be enough for a simple web browsing or an office business.
Note (mobile device users): The mobile devices that support 4G LTE have greater download/upload speed than those with 3G only. To learn more about mobile broadband, read this article by Ispreview.
Every application and widget is active in the background, occupies the device's RAM memory and decreases the Internet speed. Uninstalling the applications you don't need should increase the Internet speed.
If you are using a router and your Internet speed is slow on one computer or on all the devices, you might be experiencing issues with the quality and strength of your Wi-Fi signal. People usually place the router in a corner of their house/flat and the signal that the router emits is being absorbed by the walls. The closer you are to the router, the better.
There is an icon on the right corner of the taskbar (top right corner if you are a Mac user), which displays the strength of the Wi-Fi signal. If the bar is not full, try placing your router in a central location so that it will be in range (it will broadcast the signal out in equal strength in all directions) of every device you use, and the signal will be stronger.
The router sometimes makes the Internet connection slow, unexpectedly. Other times it doesn't reconnect to a network automatically. There are lights on every router which should tell you whether the internet connection is active or not (i.e. if you can browse the Internet or not.
If you notice that the lights are not working properly, the best solution is to restart the router. The easiest way to restart the router is to unplug the power cord from the outlet and wait for a couple of minutes. After that plug it back in the outlet and everything should be fine.
Change the power plan (Disable power−saving mode)
If you are a Windows user (especially if you have recently upgraded your computer to Windows 8 or Windows 10) and your Internet speed has become very slow, the power plan settings might be the problem. Windows 8(.1) and Windows 10 try to save power wherever it's possible by limiting the hardware components (one of which is the network card). To change the power plan (disable power-saving mode), and hopefully resolve the "my internet connection is too slow" issue follow the steps below:
Go to the start menu and type device manager.
Once the Device Manager opens, click on Network adapters, right click on your Wi-Fi adapter and click on Properties;
Click on the Power management tab (the last one) uncheck Allow the computer to turn off this device to save power;
Click on the Advanced tab;
Change the values of:
Afterburner to Enable
AP Compatibility Mode to Higher Performance
Minimum Power Consumption to Disabled
Power output to 100%
Power Save Mode to Disabled
Reboot the computer and once it turns on, go to speedtest.net to test your Internet speed.
Note: The options in step 5 may vary from computer to computer or Wi-Fi adapter.