When QUIC protocol is enabled connection is very slow

[Batman2814]

Please answer the following questions for yourself before submitting an issue.

• I checked the knowledge base and found no answer
• I checked to make sure that this issue has not already been filed

AdGuard VPN version

Version 2.11 Nightly 4

Operating mode

Integration with AdGuard

Which DNS server do you use?

Custom DNS

DNS protocol

DNS-over-QUIC

Custom DNS

No response

Environment

- OS: Android 14 One UI 6.1
- Device:Samsung Galaxy S24 Ultra

Root access

• yes, I have it

Issue Details

Steps to reproduce:

1. Switch AdGuard VPN Protocil to QUIC in AdGuard VPN for Android
2. Might have to wait a while before it starts to show slow connections and slow loading images

Expected Behavior

Should be fast connections when using QUIC

Actual Behavior

Slow speeds when using QUIC protocol in adguard vpn for Android with sometimes not loading at all.

Screenshots

No response

Additional Information

No response

[Batman2814]

Logs have been sent

[maxikuzmin]

@Batman2814 how often does the problem recur? Is the connection slow for a long time or does the connection normalize later?
If you have to wait a while for the problem to recur, does that mean the connection speed is normal at first?

[maxikuzmin]

@Batman2814 any news?

[Batman2814]

It seems to be better after updating to version 2.11 Nightly 5 for Adguard VPN for Android. I'll keep monitoring it to let you know for sure, so if you could keep this issue open until I confirm, that would be great.

[maxikuzmin]

@Batman2814 okay, it will be better to observe more

[maxikuzmin]

@Batman2814 any news?

[Batman2814]

It seems to be okay for now. The only issue is when using Speedtest to run a speed test, the results show low speed results, even though I know I have fast speeds.

[maxikuzmin]

@Batman2814 how often does this happen? after changing protocol do you wait for some time? 10-15 sec. I checked this on my device, but I don't have this problem repeatedly

[Batman2814]

It usually happens hours after that when surfing the web or going through social media like Instagram. X (formally Twitter) server connection freezes, and in order to fix it, you have to disconnect the VPN and then connect again.

[Batman2814]

When QUIC Protocol is enabled on AdGuard VPN for Nightly Version 2.11 Nightly 6, the speed test download test shows slow speeds and uploads too.

Screen_Recording_20241109_115331_Speedtest.mp4

When QUIC is disabled and HTTP/2 using AdGuard VPN Protocol in AdGuard VPN for Android Version 2.11 Nightly 6 the speeds test are normal fast like it should be.

Screen_Recording_20241109_115605_Speedtest.mp4

[maxikuzmin]

@Batman2814 thank you! Right now there are speed issues to HTTP/3 (QUIC) sites via QUIC protocol, we are working on resolving this issue, please wait

[Batman2814]

Could you please provide an estimated timeline for the resolution of this issue and specify the version in which the fix will be implemented?

[maxikuzmin]

@Batman2814 there is no exact timeline at the moment, we need to investigate the issue. I think in one of the next updates. Please wait