while installing htop first time, the $HOME/.config/htop/htoprc was created by using htop for the first time and the delay value was created by the parameter -d and not update forever

[bigbang009]

when i install htop (2.2.0 version) in CentOS Linux release 7.5.1804, I find that $HOME/.config/htop/htoprc was not created. When i using htop -d 1, the config file was created and the delay value is 1 (0.1s). But, I find that, when i use htop command again without -d paramater, the screen text flush frequency is 10 times/s, that's equal to delay value of config file.
why the delay value of config file was created by the htop -d parameter for the first time?