Throttled connection at 100Mbps

Question

Hello. I've been finding my connection on my PC rather slow for a while. I only looked into it today and it seems (according to the speed test) that I'm limited to 100Mbps instead of 1000. My router is connected to a switch which is in turn connected to my PC. For the port my PC is plugged into, the 100Mbps light is on, while on the other ports the 1000Mbps light is on. Knowing that initially, in the same configuration, my PC was receiving 1000Mbps. I unplugged the other devices to leave only my PC but it hasn't made any difference... Thank you in advance for your help!

jee pee · Accepted Answer

Hello,  First, do you have an ADSL or Fiber internet subscription?  The switch light is a better indicator than a speed test ;-) So it's either the cable or your PC's network card. You should check the properties of your connection like:  and in the properties of the card, make sure the speed selection is set to Automatic.  You should also provide the model of your card to check that it is indeed gigabit.

brucine · Answer

Hello,  Even if there were only 100 Mbps, it cannot be considered slow: a mid-range fiber connection often delivers only 200 or 300 Mbps, which are already very fast and incomparable to ADSL, but that's not the issue.  The measurements you report are those of the LAN speed (switch, cables, network cards) and concern a hardware issue limiting this speed, such as the capabilities of the switch or the network card on the PC.  But they are not the WAN speeds normally expected from a speed test, probably because this test takes into account a local IP instead of the public IP.

Clarckos · Answer

Hello.  As JeePee says, and according to the description, there's little chance that the switch is manageable, so either the cable got damaged, and there it takes 1 minute, you just need to test another one (Cat 5e) or check the network card settings that the speed is not capped at 100 mbps.    -- HBFS

brupala · Answer

Hi, there's something I don't get: you say that the switch light indicates 100 Mbit/s and the PC shows 1000, technically, it can't work like that. Are you sure it's this port that's at 100 and not the port to the box? like in this discussion next to it Honestly, it seems like it's just one of those days :-( Are switches overheating?

Throttled connection at 100Mbps

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