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[Bug] AX55 SLOW SMB throughput (3–4 MB/s) on Windows 11 unless SMB signing is disabled

[Bug] AX55 SLOW SMB throughput (3–4 MB/s) on Windows 11 unless SMB signing is disabled

[Bug] AX55 SLOW SMB throughput (3–4 MB/s) on Windows 11 unless SMB signing is disabled
[Bug] AX55 SLOW SMB throughput (3–4 MB/s) on Windows 11 unless SMB signing is disabled
23 hours ago - last edited 22 hours ago
Tags: #USB Sharing
Model: Archer AX55  
Hardware Version: V1
Firmware Version: 1.5.10 Build 20251119 rel.50509(4555)

On Windows 11, the AX55 SMB share was only 3–4 MB/s. Disabling SMB client signing with Set-SmbClientConfiguration -RequireSecuritySignature $false raised it to about 30 MB/s. This looks like a compatibility/performance issue between the router’s SMB implementation and Windows’ SMB signing defaults.
 

  • FTP stayed fast, so the disk/USB link is fine

  • Tested with both NTFS and eXFAT file systems

  • SMB signing change improves it to ~30MB/s

  • Perhaps related, Ethernet is about ~30MB/s, whereas WiFi goes to about ~40MB/s

 

More info: Reduced performance after SMB Encryption or SMB Signing is enabled

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Re:[Bug] AX55 SLOW SMB throughput (3–4 MB/s) on Windows 11 unless SMB signing is disabled
12 hours ago

Hello @Discokatt ,

The performance difference you're seeing when disabling SMB signing suggests that the router's CPU may be struggling with the cryptographic overhead of SMB signing, which is enabled by default in Windows 11 for security reasons.
Thank you for sharing this solution; it should be helpful to other users as well.

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#2
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Re:[Bug] AX55 SLOW SMB throughput (3–4 MB/s) on Windows 11 unless SMB signing is disabled
11 hours ago

  @Joseph-TP 

 

Thanks for the reply. With respect, I think the CPU overhead may be a symptom rather than the root cause.

 

Users on more powerful TP-Link routers report similar performance issues. If CPU capacity were the primary cause, a stronger chip should handle it better.


Comparable hardware manage SMB signing without this level of degradation, which suggests the issue is in how TP-Link’s Samba implementation handles signing overhead. My guess would be that the tp link firmware is not efficiently leveraging the CPUs AES decryption capabilities.

 

Since Windows 11 now requires SMB signing by default, this will affect an increasing number of users. A firmware-level improvement would be the right fix, rather than asking users to weaken their Windows security settings.

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