topic Recent upload latency issues in Broadband

Recent upload latency issues

jacob182 — Wed, 07 May 2025 12:30:37 GMT

Hi there I'm wondering if anyone is able to help with my Three 5G Broadband. I've had it for about 8 months and it's been great but for the past week there have been issues with the upload latency. This leads to constant lag when playing online computer games or using remote desktop for work.

This was first seen over wifi and persisted when connected via Ethernet. Over Ethernet to the Zyxel NR5103EV2 the download/upload speeds are fine:

But whenever I am uploading the latency increases by 232 ms on average & spikes as high as 1.3 seconds.

I'd read online that enabling UPnP on the router can help with this issue but it's not made any difference. Does anyone have any suggestions? Thanks.

Re: Recent upload latency issues

Powerful — Wed, 07 May 2025 14:46:47 GMT

Hello, experiencing similar issues but also ping problem …. If you ping google.co.uk persistently it may be that you are also having huge ping spikes also, further adding to your issue.

Re: Recent upload latency issues

theabstar — Wed, 07 May 2025 17:12:14 GMT

Been having the same issue for over a week now. Both game latency and issues with online video meetings as well unfortunately no solutions have worked for me,

Re: Recent upload latency issues

tic_oli — Thu, 08 May 2025 18:34:16 GMT

same issue

Re: Recent upload latency issues

Jaxo — Sun, 11 May 2025 19:10:40 GMT

Same issue I have been talking to them over 2 weeks now still no resolve

Re: Recent upload latency issues

jacob182 — Mon, 12 May 2025 10:57:37 GMT

Can anyone from Three comment on whether or not this is being investigated? Just browsing these forums shows a lot of people have recently started having very similar issues.

Re: Recent upload latency issues

Sirphat — Mon, 12 May 2025 14:29:13 GMT

Hi there, same issue here. Mine highest ping spike was 4-500 can't play any online game with it. just wonder does other internet provider have this issues?

Re: Recent upload latency issues

JonathanB — Tue, 13 May 2025 14:15:43 GMT

Hi @jacob182,

Yes there's been quite a few posts specifically around ping/latency. I've flagged this up last week, but we're still looking into what may be the root cause. sounds very similar. Some Community members have mentioned using three.co.uk APN instead of 3internet as a workaround.

It's not a permanent fix as the default APN is usually better for Broadband services, but it may be worth a try in the interim.

Thanks,
Jonathan

Re: Recent upload latency issues

theabstar — Wed, 14 May 2025 15:59:07 GMT

Any updates on how much longer this will occur for?? The APN fix doesn't work for all. I myself have switched and still having major issues

Re: Recent upload latency issues

JonathanB — Thu, 15 May 2025 15:17:59 GMT

Hi @theabstar,

I'm sorry that you're still encountering this issue, thanks for all your patience so far. I'm continuing to flag all the feedback. Hopefully it won't be too long till the technical teams can identify the root cause of this and get everything back to normal for you all.

Thanks,
Jonathan

Re: Recent upload latency issues

Klaus — Sat, 17 May 2025 21:35:39 GMT

Seem issue here in London area. The upload latency could range from 17.2 ms to 410 ms, which is a huge jitter.

Re: Recent upload latency issues

Klaus — Sat, 17 May 2025 21:37:17 GMT

Same issue here in London Area. Huge upload latency spikes (> 400 ms).

Re: Recent upload latency issues

JonathanB — Tue, 10 Jun 2025 15:24:21 GMT

Hi everyone,

Thanks for your patience with these latency and packet loss issues. We've deployed some updates at the end of May, and this should have resolved the situation, please let us know if you've been seeing improvements in the last couple of weeks?

Thanks,
Jonathan

Re: Recent upload latency issues

MymsMan — Tue, 10 Jun 2025 16:00:33 GMT

I did experience a period of high latency between 02:00 and 10:00am on 8th June, this was resolved by rebooting the external hub

The previous period of high latency was 22-23 May, Normal latency for Ping Google is around 20ms

I am not one of those who has been plagued by constant high latency - rebooting has resolved the issue when it has occured

Re: Recent upload latency issues

JonathanB — Wed, 11 Jun 2025 10:43:30 GMT

Hi @MymsMan,

Thanks for confirming, as you say probably not the same issue as the others mentioned, but glad to hear that it was a minor issue that was fixed by a reboot in your case.

Thanks,
Jonathan

Re: Recent upload latency issues

jacob182 — Mon, 16 Jun 2025 16:23:27 GMT

Hi Jonathan I'd meant to post an update to this thread a couple of weeks ago. There has been a significant improvement in the last few 2-4 weeks with the upload latency issues I was having.

The APN workaround did help to a degree but still wasn't as good as it was before. Once I noticed the improvement on the three.co.uk APN I changed it back to 3internet & I've not had any issues since.

Thanks for passing on our feedback & for the workaround in the mean time. Cheers