It is a tad unusual and I can’t really say why specifically in your case, but I do have some ideas.
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First, let’s review exactly what kind of speeds you’re talking about here.
WiFi wireless internet (802.11g – the standard that most of the wireless access points have these days) allows for speeds up to 54 Mbps – 54 million bits per second. 802.11n supposedly supports up to 600 Mbps, although it’s rarely seen.
On the other hand, wired Ethernet comes in roughly three flavors: 10 Mbps, 100 Mbps, or 1000 Mbps (also known as a gigabit per second). Wifi, or more correctly “Wi-Fi™“, is a wireless radio signalling protocol that defines a way for data – typically ethernet data packets – to be transmitted wirelessly between devices.
As a result, there are a couple of things that could be at play here. It’s possible that the television has a 10 Mb Ethernet port. In other words, your wireless could be doing better than 10 Mb because it could be going up to say 54 Mb, but your TV is still stuck with a 10 Mb Ethernet connection. That’s a potential hardware limitation of the actual Ethernet adapter that they have placed in that TV.
It is also possible that the connection at the other end of the cable – the router or switch – is 10 Mb. But because you have other devices that are not showing this kind of slowdown, my guess is you’re plugging them all into the same device, and that device can handle faster speeds.
Issues with the cable
The actual cable being used could also contribute to this scenario. The cable could be low quality, it could have a kink in it, or any number of things that could adversely affect the speed of the signals that travel across it.
That’s easy to fix. See if you can find a new or better cable and check if that doesn’t improve the speed.
Now, it’s also possible that this is a configuration issue. I have a hard time even explaining where to look, but it’s possible that your TV is configured to use its wired Ethernet connection at a slower speed than it’s actually capable of. That’s something you’ll have to investigate.
Wired or wireless TV
Finally, I just noticed that it’s unclear whether your TV is wired or wireless. If the TV itself is wireless, then you run into all sorts of interesting problems with interference. In other words, the wireless signal could be getting slowed down by traveling through different types of interference.
Because you’re asking about cable and Ethernet speed, my guess is that you actually have it connected by cable and all of my prior comments apply. In that case, it’s a wireless thing and something that you should note.
Ultimately, it’s really difficult to diagnose. The very first thing that I would try is to grab another cable and see if the quality of the cable isn’t what’s slowing this particular connection down.