F5F Stay Refreshed Power Users Networks How slow is my internet coming from my router?

How slow is my internet coming from my router?

How slow is my internet coming from my router?

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ArcticSky
Member
70
03-31-2026, 04:55 PM
#1
So my internet provider gives me fiber, and usually my download is around 900 Megabits per second while my upload is about 400 Megabits per second. It works perfectly if I plug a cat5E ethernet cable straight from the modem to my PC. But when I connect through my router (modem -> router -> pc), the upload speed seems to get capped at around 100 Megabits per second, sometimes even less. The download stays the same though. When I use Wi-Fi in 5Ghz mode, everything works great. I tried updating all my network drivers and doing a clean install of the system. Yes, I have that specific 2.5 Gigabit ethernet adapter on my motherboard. My router is an Asus RT-AX53U. I did a factory reset and didn't enable any QoS settings. The firmware is already up to date. Every driver on my computer has been updated too. My question is: What can I do to stop this upload speed limitation? Edit: Oh, right, I use the latest Windows 11 Home edition.
A
ArcticSky
03-31-2026, 04:55 PM #1

So my internet provider gives me fiber, and usually my download is around 900 Megabits per second while my upload is about 400 Megabits per second. It works perfectly if I plug a cat5E ethernet cable straight from the modem to my PC. But when I connect through my router (modem -> router -> pc), the upload speed seems to get capped at around 100 Megabits per second, sometimes even less. The download stays the same though. When I use Wi-Fi in 5Ghz mode, everything works great. I tried updating all my network drivers and doing a clean install of the system. Yes, I have that specific 2.5 Gigabit ethernet adapter on my motherboard. My router is an Asus RT-AX53U. I did a factory reset and didn't enable any QoS settings. The firmware is already up to date. Every driver on my computer has been updated too. My question is: What can I do to stop this upload speed limitation? Edit: Oh, right, I use the latest Windows 11 Home edition.

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XylixTv
Member
193
04-02-2026, 07:07 AM
#2
Is that what you really mean with the words "mBit" and "mByte"? They are actually two separate concepts. A byte equals eight individual bits.
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XylixTv
04-02-2026, 07:07 AM #2

Is that what you really mean with the words "mBit" and "mByte"? They are actually two separate concepts. A byte equals eight individual bits.

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crost95
Member
189
04-04-2026, 05:53 AM
#3
Yeah, I'm pretty good at working in the IT field. But networking isn't my strong suit. It's just a gigabit connection. If I could have 900 Megabytes per second download and 400 upload speed, I'd be shocked, but it is megabits.
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crost95
04-04-2026, 05:53 AM #3

Yeah, I'm pretty good at working in the IT field. But networking isn't my strong suit. It's just a gigabit connection. If I could have 900 Megabytes per second download and 400 upload speed, I'd be shocked, but it is megabits.

D
DqreDevil
Junior Member
18
04-04-2026, 08:21 AM
#4
Which software is you testing with those screenshots? Screenshots work best for me.
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DqreDevil
04-04-2026, 08:21 AM #4

Which software is you testing with those screenshots? Screenshots work best for me.

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XxXSLOANERXxX
Member
71
04-04-2026, 09:49 AM
#5
I used to try both Speedtest.net and Fast.com, but Fast.com wasn't good because I'm in Hungary. Right now, Speedtest.net is the best tool for my area.
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XxXSLOANERXxX
04-04-2026, 09:49 AM #5

I used to try both Speedtest.net and Fast.com, but Fast.com wasn't good because I'm in Hungary. Right now, Speedtest.net is the best tool for my area.

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XylixTv
Member
193
04-04-2026, 02:16 PM
#6
It sounds like something with the cables is wrong. What kind of ethernet cables do you have, and did you try some other ones?
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XylixTv
04-04-2026, 02:16 PM #6

It sounds like something with the cables is wrong. What kind of ethernet cables do you have, and did you try some other ones?

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jlien11
Senior Member
253
04-04-2026, 11:54 PM
#7
Here is the result. Sorry, it's quiet here at night. I bought two brand new Cat5E ethernet cords and tested them all.
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jlien11
04-04-2026, 11:54 PM #7

Here is the result. Sorry, it's quiet here at night. I bought two brand new Cat5E ethernet cords and tested them all.

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GhostOfDay
Member
91
04-09-2026, 01:45 PM
#8
https://imgur.com/a/99TVC6v Here is an update: I found a new Cat5e cable. I haven't been using it yet because it's 5 meters long, but I tested it just for fun and it was definitely a cable problem. It's kind of funny how two brand-new cables broke at the same time as the ones I had before. Anyway, thanks to everyone!
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GhostOfDay
04-09-2026, 01:45 PM #8

https://imgur.com/a/99TVC6v Here is an update: I found a new Cat5e cable. I haven't been using it yet because it's 5 meters long, but I tested it just for fun and it was definitely a cable problem. It's kind of funny how two brand-new cables broke at the same time as the ones I had before. Anyway, thanks to everyone!

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samirRB
Member
58
04-09-2026, 04:15 PM
#9
In many ways, old-fashioned cable might be better than new because so much fake ethernet wire is out there right now. Copper metal has become really expensive and instead of just raising the price, many companies are finding ways to use less copper, like using thinner wires. A lot of the cable you see being sold for ethernet doesn't actually meet what's needed for real ethernet cables. So unless you spend a long time reading all the small details, you might end up getting ripped off.
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samirRB
04-09-2026, 04:15 PM #9

In many ways, old-fashioned cable might be better than new because so much fake ethernet wire is out there right now. Copper metal has become really expensive and instead of just raising the price, many companies are finding ways to use less copper, like using thinner wires. A lot of the cable you see being sold for ethernet doesn't actually meet what's needed for real ethernet cables. So unless you spend a long time reading all the small details, you might end up getting ripped off.