Only 1 device getting full speed

[#1]

I had full fibre installed today, I went for the 500mbps. After the engineer left of course the first thing I did was check the speed, I checked on my phone and it was getting 466mbps. However on any other device, it only seems to be getting 90-100mbps, even if I disconnect my phone. The other devices are another phone and PS5 using Wi-Fi, and a PC using ethernet. For the PC I initially thought it may be due to the cable being quite old, so I have ordered a new one but I don't know if this is going to fix the issue since it's also happening on Wi-Fi devices other than my phone.

Does anyone know what might be happening? And if there's anything I can do to resolve this? Thank you.

[#2 · Accepted solution]

It's possible that your other WiFi devices are connected to the 2.4ghz band ( rather than the 5ghz) which will limit the speed.

As for the ethernet connected device , is the cable a cat5e or better ? If it's only cat5 it will be limited  to 100Mb

[#3]

Moderator's note:
Thread moved from Full Fibre to My Router.

[#4]

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@MisterW wrote:

It's possible that your other WiFi devices are connected to the 2.4ghz band ( rather than the 5ghz) which will limit the speed.

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And the cable will only help if the PC has a GbE ethernet port (or higher) in the first place. If it only has a 10/100 ethernet port then it's not going to matter what cable you use, you'll still max out at ~100mbps.

[#5]

@Chloesianf @MisterW  Rather than the Category of ethernet cable (Cat 5 or 5e) it must have 4 pairs to work at 1Ghz. I have cat 5 patch cables with 4 pairs (i.e. all 8 RJ45 connector pins in use), I also have 2 pair Cat 5e cables that will limit the speed to 100Mbps.

[#6]

Change 'PC' to 'device'?

Examples. The latest Freesat boxes have 100Mb ethernet. Yealink W70B is 100Mb ethernet.

(Although it is quite likely that this h/w limitation will not impact on current and immediate future performance. Esp VoIP?)

[#7]

@MisterW
This was exactly the problem!
Found the setting on PS5 to change to 5ghz and that solved the problem there.
The cable was pretty old and second hand so I have no idea what cat it was, but the new one I ordered was cat8 and now we're getting 531mbps on the PC.
The other phone is quite old as well but should still get up to 300mbps, however after a bit of googling we found out it's a DNS issue and there's an app that can fix it, but there's not much point as this phone isn't used for much.