Upload Slow but Download Fine? Read the Link Rate

You can stream anything you like, but sending one video takes an hour and your camera freezes on every call. It is not in your head and it is usually not a fault.

Before you ring the provider, there are two numbers worth reading, and one of them explains most of it.

I read the Wi-Fi connection on this machine and the interesting part was not the speed. It was the single word printed next to it.

Two different complaints inside one question

Separate these first, because they have different answers. Download fine, upload slow, everywhere in the house is your connection or your plan. That one is usually deliberate.

Upload slow only on this PC and fine on a phone is this machine or its Wi-Fi, and it is fixable. Upload slow only on Wi-Fi and fine on a cable is the radio, and this page spends most of its time there.

Ours: the number this machine reports, and the word beside it

Two values here, and the second is where the answer is. Read yours the same way, in Terminal:

Get-NetAdapter | Select-Object Name, LinkSpeed, FullDuplex, Status

Ours, read off the wireless adapter here: the link reports 86.5 Mbps, and next to it Windows prints full duplex: False. A wired adapter will say True. A wireless one says False, and that is normal rather than broken.

Half duplex means one direction at a time. Your upload and your download are not two lanes, they are one lane taking turns. So on Wi-Fi, uploading competes with everything else being downloaded, including the stream in the other room.

The link rate is not your speed

This number does not mean what people think. A third of the advertised figure at best, and the rest goes on overhead and on resending data that did not arrive. Ours: an 86.5 Mbps link will not deliver 86.5 Mbps in either direction.

Documented by NETGEAR on its link rate and transfer speed page: "A link rate of 300 Mbps usually corresponds to 50 to 90 Mbps speed on the TCP/UDP layer."

NETGEAR says why it moves: "The link rate is directly related to WiFi signal strength." It falls as you walk away: "As the WiFi client moves further away, its signal strength is reduced, and the link rate goes down."

Why upload is the smaller half to begin with

The part that is nobody's fault. Ours rather than quoted: most home broadband is sold asymmetric. The download figure on your bill is large and the upload figure is a fraction of it.

Fibre is often the exception, with the two figures matching. Cable and older lines are usually nowhere near. Check your own bill or your provider's account page. I had to hunt for mine, and it was there in much smaller type.

We could not find a manufacturer or regulator page we could verify stating that split outright, so the point above is ours rather than quoted.

Where you actually notice it

Four places, and they are the ones people complain about. Video calls first. Your camera is upload and everyone else's is download, which is why you can see them perfectly while they see a slideshow of you.

Cloud backup and photo sync are all upload, running quietly, and often the thing eating what little you have. Sending large files or attachments is the classic one, and the reason people start searching.

Game streaming or hosting is upload again, and the least forgiving of the four.

What is worth trying, shortest first

None of these costs anything. Move closer to the router, or use the 5 GHz network. Signal strength sets the link rate, and I would try that before changing a single setting.

Pause the backup before an important call. One setting, and it frees the whole upload path. Then run a speed test and read only the upload number, compared with what you are paying for, not with your download.

Try a cable once as a test. If upload is fine on Ethernet, that proves it is the radio, not the line. If downloads are slow too, this is not your page. That one has a completely different list.

When it is not the Wi-Fi at all

Three to rule out before you call anyone. One app slow and everything else fine is the app or its server, not your line. Slow at the same time every evening is contention on the provider's network, and no setting on your PC touches it.

Weak signal in one room only is a different thing. That is a placement problem with its own fixes.

On a Mac whose uploads slowed right after macOS Tahoe or macOS 27, owners traced it to a network setting instead, and the Mac upload page has the Terminal command.

Status: read against NETGEAR's link rate documentation, 26 August 2026, on Windows 11. The link rate and duplex state were read here. No vendor page on asymmetric plans could be verified.

Why is my upload speed so much slower than my download?

Usually because that is what you are paying for. Most home broadband is sold with a large download figure and a much smaller upload one, and fibre is the common exception.

On Wi-Fi there is a second reason on top: the radio is half duplex, so your upload shares one lane with everything being downloaded.

What does full duplex False mean on my Wi-Fi adapter?

It means one direction at a time. A wired connection sends and receives simultaneously and reports True.

Wireless cannot, so it reports False, and that is normal rather than a fault. It is also why a busy house slows your upload more than you would expect.

Is my 86 Mbps link rate my actual speed?

No, and it is not close. NETGEAR documents that a 300 Mbps link rate usually delivers 50 to 90 Mbps in practice, because of overhead and resent data. Treat your link rate as a ceiling you will never reach, not as a speed you have.

Will a better router fix my slow upload?

Only if your Wi-Fi is the bottleneck. Test it with a cable first. If upload is just as slow on Ethernet, the router is innocent and the limit is your plan or your line, and no equipment you buy will change it.

The Short Version

• Separate three cases: everywhere, this PC only, or Wi-Fi only.
• Read your adapter's link rate and duplex state with the one-line command.
• Wireless reports full duplex False. That means one direction at a time.
• Your link rate is a ceiling, not a speed. Expect a fraction of it in practice.
• Signal strength sets the link rate, so distance costs you upload directly.
• Most home plans sell a small upload figure next to a large download one.
• Video calls, cloud backup and large attachments are all upload.
• Test once on a cable. It settles whether the radio is your problem.

Where to Next

Run the line above and look at the two values it prints. The speed is interesting, but the duplex word is the one that explains your evenings.

Then pause your cloud backup and try the same upload again. That single change fixes more slow calls than any router purchase.

Test once on a cable if you can. Five minutes, and you will know whether to blame the radio or the plan.

If downloads are slow as well, you are on the wrong page and I would rather point you at the right one. The download version has its own causes.

If your upload turned out to be something none of this covers, say what it was in the comments. Upload problems get far less attention than they deserve.