LM4 (i.MX28) SW: 20240426 lagging

[puntukas]

Recently updated LM4 to SQ20240426 and the system became noticeably laggy and almost UNUSABLE.
KNX event-based scripts execute with several seconds delay.

Version: 20240426
CPU/IO: 0.28 0.45 0.64
Memory: 35%
KNX/TP: OK

CPU sometimes peaks to 1.5 without visible load.

There are 2 Modbus devices configured.
Polling was 10s, now increased to 45s, but lag still present.
Stopping several Lua scripts did not change behaviour.

Previous firmware worked perfectly on the same hardware.

Is there any known issue with KNX stack, scheduler or IO handling in SQ20240426?

Any ideas what to do?

thanks!