LM5 pretty slow

[tuxtof]

since few weeks my LM5 is very very slow


load and memory is OK but UI and event script are so slow

i try to reboot it, no improvement

info:
CPU model : ARMv7 Processor rev 5 (v7l)
Linux kernel version: 4.4.302
System uptime: 0d 0h 10m
Load averages: 0.00 0.00 0.00

Total system memory: 122.1M
Used: 15.5M (13%)
Free: 106.6M (87%)
Buffered: 0.9M
Cached: 9.6M

Firmware: 20230607

how to debug deeper ?
any idea are welcome ?