Performance difference between different versions of bash

[wang yuhang]

Hi


I found that there is a huge difference in performance between different 
versions of bash when there are a large number of environment variables in my 
system.


The steps to reproduce are as follows??
$ for i in `seq 10000`; do export TEST_ENV_$i=$i; done
$ time echo `date`


In bash-4.3, it only takes 0.002 seconds, but in bash-5.2, it takes up to 0.5 
seconds.


I want to know if this is due to certain features in the higher version of bash 
or due to some hidden bugs. 


I hope to get your help.