OpenWrt 25.12.0 Performance problem

Installing and Using OpenWrt
16

I am experiencing performance and stability issues since upgrading from OpenWrt 24.10.6 to 25.12.x.

Wi-Fi issue:

With OpenWrt 24.10.6, Wi-Fi performance is normal and responsive. However, with versions 25.12.0 and 25.12.1, I observe significant latency when loading web pages.

  • Speed tests (upload/download) show similar results between 24.10 and 25.12.

  • The issue appears during real-world usage (e.g., opening a web page).

  • With 24.10, pages load immediately.

  • With 25.12, there is a delay of several seconds before the page begins to load.

Downgrading back to 24.10.6 restores normal responsiveness.

This issue occurs on all my access points (Zyxel WSM20).

LAN issue:

There is also a LAN stability problem on 25.12.x:

  • After a random uptime of several days, LAN communication stops completely.

  • Devices on the LAN can no longer communicate.

  • Reverting to 24.10.6 resolves the issue and restores normal operation.

Hardware:

  • Zyxel WSM20 (multiple units)

Steps to reproduce:

  1. Install OpenWrt 25.12.0 or 25.12.1

  2. Connect via Wi-Fi

  3. Attempt to browse websites → noticeable delay before loading starts

  4. Wait several days → LAN communication may stop

Expected behavior:

  • Immediate page loading (as observed on 24.10.6)

  • Stable LAN communication over time

Actual behavior:

  • Delayed page loading over Wi-Fi

  • LAN stops communicating after several days