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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I saw AX55 PRO v1 mentioned and I wanted to share that the latest beta doesn't fix the bufferbloat when QoS is activated. The bufferbloat is lower when QoS is disabled, both on the latest official firmware and beta.
Testing method:
PC 1 - single one with priority on QoS
Mobile phone - watching 4k live video on youtube
Bufferbloat is higher on the PC 1 with QoS on, then with it disabled.
The test was done on a 1000mbps up/down internet connection.
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Hello @Maurooo1,
It appears you have the Archer GXE75 Pro model, and the 1.4.3 Beta firmware hasn't resolved the 'Bufferbloat after enabling QoS' anomaly.
May I know if your network topology diagram is as follows:
ISP modem—GXE75)))((( client devices
(Note: — stands for wired connection,)))((( stands for wireless connection )
Please provide comparative test results with and without QoS enabled, preferably with relevant screenshots.
Including buffer overflow and latency results. You can refer to the method described by user Pankajuuuuu.
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Good afternoon and thanks again for the help. If I activate QoS and set the download speed to 600, the latency decreases. However, if I set it to, for example, 660 to get the actual 600+ download speed, the latency is high. The latency is fine now, but this consumes more download bandwidth when QoS is active. If I deactivate it, the latency is terrible, but the download speed is fine.
QoS configurado a 620 mb
QoS Disable .
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@Joseph-TP Hi Joseph, Thanks for the reply, The problem is not installing the firmware, the problem is that on the link at the beginning of this topic I can't even download the firmware for my router Archer GXE75_V1 , it seems that the link provided here is not usable or not valid to download it. Link of the firmware I can`t download
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@Maurooo1 If I may give you a tip to try, it's to set various download and upload QoS values and test it, even if they don't exactly match your total available bandwidth. For example, I have a very poor FTTC connection with 20 Mbps download and 3 Mbps upload. I found the best results by setting a QoS of 19 Mbps download and 4 Mbps upload, bringing the buffer bloat from level F to level A. Changing those values even by just one Mbps in upload or download significantly worsened the results.
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Hello @iteo92 ,
Yes, you're right. The link seems to be acting up. I tested it before, and it downloaded normally. I'll apply to the relevant department again.
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Hello@rotty,
May I know if your network topology diagram is as follows:
ISP modem—AX55 Pro)))((( client devices
(Note: — stands for wired connection,)))((( stands for wireless connection )
Please provide comparative test results with and without QoS enabled, preferably with relevant screenshots.
Including buffer overflow and latency results. You can refer to the method described by user Pankajuuuuu.
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Hi, with or without QoS enabled, Cloudflare gets the same results.
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