Technology Explained

3 Reasons Your Wi-Fi Dongle Speed and Performance Sucks

Joel Lee 08-12-2017

A dongle is a small device, typically in the shape of a USB flash drive, that plugs into another device and provides extra functionality. A wireless dongle, also called Wi-Fi adapter, is a thumb-drive-looking device that provides Wi-Fi capabilities to a device that otherwise isn’t Wi-Fi-capable, such as a desktop PC with no wireless network card.


Dongles are generally useful because they can be easily moved between devices, they don’t take up much space, and the added functionality is convenient (e.g. a Roku Streaming Stick lets you stream thousands of services directly to your TV).

But when using a wireless dongle, you may run into some issues — in particular, poor wireless speeds that don’t live up to what your ISP plan can deliver. Here are some reasons why you may have subpar wireless dongle performance and what you can do about it.

1. Wireless Interference

Wi-Fi devices can communicate using two different bands: the 2.4GHz band, which is older and supported by most devices but slower, and the 5GHz band, which is newer and faster but has a shorter range and is only supported by devices from the past few years.

While modern wireless dongles tend to support both bands, you can only utilize the 5GHz band if your router also transmits on the 5GHz band. If your router isn’t a dual-band router, then you’re stuck using the 2.4GHz band. This is why dual-band routers are essential 7 Wi-Fi Router Features You Need for a Fast Home Network Wi-Fi router features don't make sense sometimes. That's why we've broken down what Wi-Fi features you need and don't need. And we've even recommended the best Wi-Fi routers out there! Read More .

What’s so bad about the 2.4GHz band? Well, it’s extremely narrow. In the U.S., you only have 11 channels to choose between — and even that’s deceptive because each channel’s frequency overlaps with the frequencies of neighboring channels. This means that channels 1, 6, and 11 are the only non-overlapping channels.


Overlapping channels are bad because the wireless data waves can interfere with each other, causing lost data packets that need to be resent. Resending data packets takes time, and this can cause your wireless speed to drop. With a lot of interference, the drop can be significant.

3 Reasons Your Wi-Fi Dongle Speed and Performance Sucks wifi band channel frequency width
Image Credit: Kozuch via Wikimedia Commons

It gets worse. If you live in a densely populated building, such as an apartment complex in a major city, then you have hundreds of devices all around you trying to transmit Wi-Fi data. Even if you’re using a non-overlapping channel, transmissions on the same channel can interfere. A wireless dongle on the 2.4GHz band simply has no chance to perform well.

If you have to use 2.4GHz, make sure you’re using the newer N mode instead of “legacy” or “mixed” mode, which is limited to 7MB/sec for backward compatibility.


The best solution? Switch to the 5GHz band.
This means you’ll need to upgrade your router to a dual-band model if your current router doesn’t support it. You’ll also need a wireless dongle that’s capable of it. Fortunately, the 5GHz band has 23 non-overlapping channels and many devices still don’t support it, so interference is minimal. Learn more about ways to solve wireless dongle interference Is Your USB Wi-Fi Dongle Lagging? 3 Ways to Fix It Got a wireless dongle that's misbehaving? Three different methods can solve the majority of dongle problems: USB extenders, changing router channels, and dual-band routers. Read More .

2. Internal Antenna

Wireless dongles come in two forms: compact ones (which have internal antennas) and bulky ones (which have external antennas).

Compact wireless dongles, sometimes called nano dongles or pico dongles, are preferred by most users because they’re tiny, portable, and more aesthetically pleasing. Who wants a massive antenna sticking out of their device? Nobody, that’s who! Plus, internal antennas are cheaper to produce so compact dongles are more affordable.

3 Reasons Your Wi-Fi Dongle Speed and Performance Sucks tplink wireless wifi dongle antenna


While internal antennas have come a long way and aren’t terrible anymore, external antennas generally provide better performance. External antennas often have higher gain and therefore better signal reception. You can point them towards the router for even better reception, and they aren’t as close to internal electronics (which can cause interference).

The best solution? Upgrade to a dongle with an external antenna.
To be fair, there’s nothing wrong with using a compact dongle with compact devices (e.g. Raspberry Pi). Just be aware that you probably won’t get full Wi-Fi speeds. A dongle with an external antenna may be ugly, but is often the more performant option.

3. Hardware Bottlenecks

There are at least three specifications you need to pay attention to.

First, the dongle’s specifications. A dongle labelled as 600Mbps probably doesn’t support that much throughput per band. Instead, it might be 150Mbps on 2.4GHz and 450Mbps on 5GHz, for a total of 600Mbps when both bands are used. Be sure to get a dongle that lives up to your ISP plan’s max speed on the band you’re going to be using.


3 Reasons Your Wi-Fi Dongle Speed and Performance Sucks lteriver wireless wifi dongle compact

Second, the USB port you plug into. USB 2.0 ports have a theoretical max speed of 480Mbps, but due to protocol overhead and hardware inefficiencies, the practical max speed is closer to 320Mbps. If you want greater data throughput, be sure to plug the dongle into a USB 3.0 port, which has a theoretical max speed of 5Gbps (faster than any modern residential connection).

Third, your maximum internet speed. If you’re paying for 25Mbps/5Mbps, then no combination of router and dongle will get you faster speeds. And most ISPs don’t actually provide What Is Net Neutrality & Why Should I Care? A significant number see Net Neutrality as essential to the survival of the Internet. In this article, we're going to look at why Net Neutrality matters, and why we should fight to protect it. Read More your plan’s full speed 100 percent of the time, so you may need to upgrade to a plan that’s even higher than what you think you need.

Other Ways to Boost Wi-Fi Performance

If you’ve tried all of the above tips but still experience Wi-Fi performance issues, we highly recommend this article on common reasons why your Wi-Fi is slow Why Is My Wi-Fi So Slow? Here's How to Fix It Need to download data fast, but have slow Wi-Fi? Why is this happening? Here's how to fix a slow Wi-Fi connection and speed it up. Read More and things that could be slowing down your home network 9 Things That Might Be Slowing Down Your Home Wi-Fi Network Tired of slow or spotty internet? Check these things that could be slowing down your home Wi-Fi network. Read More . It may not be your wireless dongle after all!

If your Wi-Fi issues stem from distance, such as your router being stuck at the other end of the house, then you should consider increasing your wireless reach using a Wi-Fi extender or powerline adapter Wi-Fi Extenders vs. Powerline Adapters: How to Fix Poor Wireless Signals If your router's Wi-Fi signals are weak and unreliable and you can't seem to find a solution, the answer may lie in Wi-Fi extenders and/or powerline adapters. Read More . If your speed issues stem from too many users on the network, try using these network-optimizing tips for home routers 7 Router Tips Every Gamer Needs to Know for Optimal Performance If you're paying for a super-fast connection, but still struggling with speeds, it could be your router. "Gaming routers" are marketed as faster than the rest. Is there any truth to that? Read More .

What kind of wireless dongle are you using? Know of any other Wi-Fi performance tips we missed? Share with us down in the comments below!

Related topics: Bandwidth, Hardware Tips, Wi-Fi.

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  1. ciscokid
    December 12, 2017 at 2:31 pm

    There needs to be 25Mhz or 5 channels of seperation between channels in the 2.4Ghz range. For example 1 and 6 or 6 and 11.
    You can certainly manually set your wireless AP to use channel 2 but bear in mind that it will overlap and cause interference problems for yourselves and other devices in the neighborhood. This is because by default wifi devices will look to use non overlapping channels in the 2.4Ghz range. Most wireless APs will automatically use channel selection to scan the nearby area for which channels are being mostly used and then select the best "non overlapping" channel. For example if you live between two houses and your neighbors are using channel 1 and 6, then very likely your Accesspoint or wifi router will auto select channel 11.

    • rc primak
      January 13, 2018 at 4:34 pm

      My Comcast Gateway not only selects within a band, but will opt for 5 GHz if 2.4 GHz is overcrowded. I live in an apartment community, so this is a frequent event.

  2. dragonmouth
    December 8, 2017 at 2:00 pm

    "This means that channels 1, 6, and 11 are the only non-overlapping channels."
    How do you figure that? Channels 1, 6 and 11 may not overlap each other but they certainly overlap other channels. From the chart in the article, it looks like Channel 1 overlaps with channels 2, 3 and 4, channel 6 overlaps with channels 4, 5, 7 and 8, and channel 11 overlaps with channels 9, 10, 12 and 13.

    • rc primak
      January 13, 2018 at 4:30 pm

      I think the idea is, if everyone only used these channels, there would be little or no overlap. No other combination in the 2.4 GHz range offers this many non-overlapping channels, and three sure isn't many!

      • dragonmouth
        January 13, 2018 at 5:58 pm

        " if everyone only used these channels, there would be little or no overlap"
        I'm sorry but that sounds counter-intuitive. The point of having 11 channels is to spread the congestion. If everybody used only 1, 6 and 11 there would be overlap BUT those channels would be super congested, making the other channels more desirable to use because not too many people would be using them.

        If everybody decides to drive on the Interstate rather than on side roads because the road is wider and the speed limit is higher, that would negate the advantages of the Interstate because it would be bumper to bumper and crawling while the side roads would have no traffic on them, making them faster.