Solution What Can I Do If QoS Enabled Causes BufferBloat and High Latency on My Router After Firmware Update?
This Article Applied to:
Archer BE230_V1/V1.20
Archer BE230_V2
Archer AX55_V1
Archer AX55 Pro _V1
Archer AX72_V1
Archer AX72 Pro_V1
Archer GXE75_V1
Archer AX53_V1
Phenomenon:
Some users have reported performance degradation in their routers after enabling QoS following a firmware update.
Specifically, Bufferbloat test scores for both wireless and wired clients have significantly decreased (e.g., from A/B to F). Serbian_Fantom mentioned this unexpected behavior here.
Additionally, a noticeable increase in upload latency may occur, resulting in higher latency and jitter when the network is under heavy load.
Disabling QoS can resolve the performance degradation described above.
We have identified the cause of these unexpected behaviors. Please take a look at the following feasible solutions.
Available Solutions:
Solution 1:
Our development team has provided the following beta firmware to address this unexpected behavior for the models that have already been reported. Please install the beta firmware for your router if you encounter this anomaly.
| Model | Direct Download Links |
| Archer BE230_V1/V1.20 | Archer BE230_V1/1.20_1.2.1 Build 20250821(Beta Firmware) |
| Archer BE230_V2 | Archer BE230_V2_1.1.3 Build 20260127 (Beta Firmware) |
| Archer AX55_V1 | Archer AX55_V1_1.5.11 Build 20260205(Beta Firmware) |
| Archer AX55 Pro_V1 | Archer AX55 Pro_V1_1.4.3 Build 20251202(Beta Firmware) |
| Archer AX72_V1 | Archer AX72_V1_1.4.1 Build 20250918(Beta Firmware) |
| Archer AX72 Pro_V1 | Archer AX72 Pro_V1_1.4.1 Build 20250918(Beta Firmware) |
| Archer GXE75_V1 | Archer GXE75_V1_1.1.1 Build 20251024(Beta Firmware) |
| Archer AX53_V1 | Archer AX53_V1_1.5.4 Build 20251230(Beta Firmware) |
Note:
- Please be sure you have read the Beta Test Agreement before upgrading the beta firmware!
- For the sake of insurance, it's always recommended to save a copy of the router's Backup Config file before upgrading or downgrading.
- You may follow the guide to upgrade the firmware of your router. How to Upgrade the Firmware on the TP-Link Wi-Fi Routers.
Solution 2:
If you don't want to try the beta firmware, you can temporarily disable the QoS feature.
We welcome you to share your experiences with the beta firmware. If the beta firmware doesn't help, please provide details on your router's current operation and any other relevant information. Like the complete network topology, specific exception details, when the problem started, etc.
What if your router model isn't among those mentioned above, but you've also experienced unexpected bufferbloat and high latency after enabling the QoS feature during firmware updates? Please provide your router model, including firmware and hardware versions, for reference: How to find the hardware and firmware version of my TP-Link device?
Thank you for your feedback and support.
Update Logs:
Jan 29th, added Archer BE230_V2 Beta Firmware
Feb 5th, updated Archer AX55_V1 Beta Firmware
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Hi again. Yesterday I tried the Acher AC1750 and it gave me lower latency on the 5GHz band. The thing is, it has separate frequencies. It turns out that with that one I had lower speed but lower latency than what I have now, which is between 400 and 500 Mbps.
But it didn't improve on PC with that; only on mobile was there less latency because the speed wasn't very good, unlike my current connection. I'll have to call my ISP again and try IPv4 mode since it's currently in bridge mode.
I will write to you again later to tell you how it went again in IPv4 mode on the ISP router.
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Hi, how are you? Well, I’ve been running the CM unit standalone—without a bridge—for the past 3 days. My download latency has dropped to between 150 and 190 ms (according to mobile speed tests), though the upload latency is somewhat high—around 240 or 250 ms. However, when I was using the TP-Link AX55 Pro v1, the download latency was much higher—between 450 and 500 ms. Is it possible to downgrade to version 1.3.3? I ask because I tried doing so previously but couldn't; it would only let me install version 1.4.
According to Google AI, it suggests that it is better to downgrade the firmware version.
But I wasn't able to do that at the time
I want to use the AX55 Pro. It is unfair that the DOCSIS 3.1 Sagemcom FAST3890 doesn't have many channels available in the 20/40/80 MHz bands—it only has 4 channels.
In contrast, the AX55 Pro had channels 36, 40, and 44. I await an urgent response. Thank you.
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As mentioned earlier, the abnormal latency on your device is likely not directly related to whether QoS is enabled. In the test results you previously provided, the download latency on the Archer AX55 Pro wasn’t this high; it was roughly 122ms when QoS was disabled, and 11ms when QoS was enabled.
Furthermore, your new router still has latency issues.
We recommend connecting your computer directly to the optical network terminal (ONT) or ISP modem via an Ethernet cable (without going through a router) to perform a latency test (ping 8.8.8.8 -t) and a speed test.
If the latency when directly connected to the ONT/ISP modem is still above 150 ms, contact your service provider immediately to report the issue and explain that the latency has abnormally increased.
Alternatively, try moving to a different location and testing a different network for comparison.
Please also contact local support for further assistance.
Joseph-TP wrote
Hello @Maurooo1 ,
I'm still a bit confused. From which devices did you get your test data?
To avoid discrepancies, I've roughly summarized your comparative test results:
- With QoS enabled and a download speed of 620 Mbps, the actual download speed is 505 Mbps, the download latency is 11ms, and the bufferbloat level is C.
- With QoS disabled, the actual download speed is 618 Mbps, download latency is 122ms, and bufferbloat level is D.
- Regardless of whether QoS is enabled or disabled, the Cloudflare server test will yield the same results.
On your phone, if it supports the AC protocol, its speed won't increase significantly because the router supports a higher protocol; it will be limited by the phone's protocol speed. May I know the model of your phone?
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@Joseph-TP https://ibb.co/wNrJ0PfZ
Good afternoon, is the test related to pinging 8.8.8.8 -t? Because if I do a ping test, the ping to 8.8.8.8 rises slightly to 160 ms in cmd, but here are the results from speedtest.
https://ibb.co/RTtx7ZBt
This is from the Cloudflare test.
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