Just tried this, and it appears to cause a very significant lag (~2 sec) after each shell command. Removing the sourcing of the config from bashrc and opening a new shell immediately gets rid of the lag. Maybe it's because I have HISTSIZE set to a large value...
Ah, thank you commenting on this! This is absolutely unintentional and was the fault of a missing comment in the bash script (that I didn't notice because I generally use zsh). See https://github.com/ddworken/hishtory/commit/72ff95ab8b23c3be... and if you run `hishtory update` it should be all fixed.