CPU update slow randomly

[sgon00]

Hi, I am new to tmux and tmux-cpu. I am running Xubuntu 24.04, tmux 3.4, xcfe4-terminal, tmux catppuccin theme.
The CPU percentage sometimes updated correctly per second.
But sometimes, it doesn't update in about 10 seconds.
This problem happens very frequently and randomly.
I just installed the plugin 10 minutes ago and I can always reproduce it within a minute. I tested with stress tool.
I have both iostat and sar installed.
I am not sure how to debug and why.
Thanks a lot for any help.

[ctjhoa]

Isn't that related to #15 ?